What is the main purpose of the exhaust system?

The exhaust system is a system of pipes and components whose task is to remove and purify exhaust gases, reduce noise and support engine operation.

What does exhaust gas purification system mean?

It is a set of components, such as a catalytic converter, DPF filter and EGR valve, whose task is to reduce harmful chemical compounds in exhaust gases and meet emission standards.

What is a lambda probe used for?

The lambda sensor monitors the composition of the fuel-air mixture and sends data to the engine control unit, which allows for optimal combustion.

How to recognize catalytic converter damage?

Symptoms include a loss of engine power, a check engine light and a characteristic exhaust smell.

Does a DPF filter fit every diesel?

No, DPF filters vary in design and parameters. They must be matched to the make, model, and emissions standard (e.g., Euro 5, Euro 6).

How often should a muffler be replaced?

Under normal operating conditions, an exhaust muffler can last up to 80,000–120,000 km, but its durability depends on the quality of the materials and driving style.

Are the exhaust system parts used safe?

Yes, provided they are verified and come from a reliable source – just like in the Global Parts store, where each part undergoes quality control.

Exhaust systems and exhaust gas treatment

At Global Parts, we offer a wide selection of original used car parts, including exhaust systems and exhaust aftertreatment components for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Each part we offer undergoes quality control to ensure you receive a top-quality product.

More information

Make

Category

Subcategory

Condition

In Stock

Price

Products in promotion

Part no. XS4E9430AC

Ford Transit Connect 1.8L Duratec Engine Exhaust Manifold XS4E9430AC

Product currently unavailable

Part no. K5T48179

Mazda 6 GJ Turbo Pressure Solenoid Valve K5T48179

Product currently unavailable

Part no. 8238075

BMW E65 E66 Heat Shield Wrap Insulation Tunnel Tank Under Cover 8238075

Product currently unavailable

Part no. 7206991

BMW Z4 E89 Exhaust Steam Line Charcoal Fuel Filter Gas Hose Pipe 7206991

Product currently unavailable

Part no. A6071400010-1

Mercedes Citan W415 Engine Exhaust Gas Manifold Diesel OM607 140045892R

Product currently unavailable

Part no. 05L906261E

Audi Q2 GA 2.0 TDI NOX Sensor Lambda Oxygen Probe 05L906261E

Product currently unavailable

Part no. A0009953533

Mercedes W205 W212 W213 W222 W251 Exhaust Connector Clamp Pipe A0009953533

Product currently unavailable

Part no. A2114710337

Heat Shield Mercedes W211 W219 Cover Plate Exhaust Muffler A2114710337

Product currently unavailable

Part no. 7804352-2

EGR By Pass BMW E60 LCI E90 335d 535d Exhaust Manifold EGR Remove 7804352

Product currently unavailable

Part no. 8576469

Nox Sensor BMW X5 F15 F30 E70 Exhaust Probe SCR Emision Sensor Module 8576469

Product currently unavailable

Part no. 7810751-5

BMW F10 F20 F30 F36 F34 F25 Diesel Engine N47N Exhaust Cooler 7810751

Product currently unavailable

Part no. 059131525BQ

Audi SQ5 8R Diesel EGR Valve Line Pipe Hose Tube 059131525BK

Product currently unavailable

Part no. 8517724

EGR Cooler BMW F07 F10 F15 F25 N47N Exhaust Manifold Gas Heat Exchanger 8517724

Product currently unavailable

Part no. LR004298

Land Rover Freelander 2 L359 2.2 EGR Cooler Coolant Pipe Hose Line LR004298

Product currently unavailable

Part no. A6511400502-4

EGR Valve Mercedes Vito Sprinter W639 W906 OM651 EGR Exhaust Cooler A6511400502

Product currently unavailable

Part no. 03G129637A-1

Volkswagen Polo MK4 9N EGR Valve Line Pipe Duct 1.4 TDI Diesel 03G129637A

Product currently unavailable

Part no. 8591189-1

BMW F40 X1 F48 Mini F56 B47B B47D Turbo Turbocharger Exhaust Manifold 8591189

Product currently unavailable

Part no. 9675743180

Peugeot Boxer 3 2.2 HDi Diesel Engine EGR Valve Cooler Pipe Hose Line 9675743180

Product currently unavailable

Part no. 7823512

BMW F10 F11 Holder Catalytic Converter Support Bracket 7823512

Product currently unavailable

Part no. 8632096-2

BMW F20 F21 F22 F30 F31 LCI Bracket Mount Holder Exhaust System Rear 8618298

Product currently unavailable

Part no. 03L906088AP

VW Tiguan 5N Exhaust Gas Temperature Sensor Pre DPF Diesel Engine 03L906088AP

Product currently unavailable

Part no. 6C1Q94308D

Ford Transit MK7 2.2 TDCi Diesel Engine Exhaust Manifold 6C1Q94308D

Product currently unavailable

Part no. A6291420201

Mercedes ML X164 OM629 Exhaust Manifold Right O/S A6291420201

Product currently unavailable

Part no. 6G9Q9E470AB

Land Rover Freelander 2 L359 2.2 Diesel EGR Valve Pipe Hose Line 6G9Q9E470AB

Product currently unavailable

Part no. 55572962-1

Opel Insignia A 2.0 CDTI Diesel Engine EGR Valve Cooler 55572962

Product currently unavailable

BMW E87 E90 116i 316i N45 Regulating Lambda Probe Sensor 7530287

-5%

Part no. 7530287

BMW E87 E90 116i 316i N45 Regulating Lambda Probe Sensor 7530287

Product currently unavailable

Part no. 6C1Q9F467AB

Ford Transit Mk7 EGR Valve Cooler Pipe Hose Line 2.2 TDCI 6C1Q9F467AB

Product currently unavailable

Part no. 6769675-1

BMW X5 Series E53 Petrol M62 4.4i 4.6is Power Steering Suction Hose Pipe Bottle

Product currently unavailable

Part no. 7553594

Downpipe Set BMW E82 E88 E90 E91 135i 335i N54 Exhaust Catalytic Pipes EVOLVE

Product currently unavailable

Part no. 8572489-1

Exhaust Tips BMW X5 F15 M Performance Muffler Pipe Left Right Set P337A

Product currently unavailable

Part no. A6121420101

Mercedes W163 W211 OM612 OM647 Diesel Exhaust Manifold A6121420101

Product currently unavailable

Part no. A6421420002

Mercedes W164 W204 Exhaust Manifold Right O/S OM642 Diesel A6421420002

Product currently unavailable

Part no. 05E129709F

Volkswagen Golf MK7 SV 1.5 TSI Petrol Air Intake Manifold 05E129709F

Product currently unavailable

Part no. A6290900134

Heat Shield Mercedes W164 X164 Diesel OM629 Left Turbocharger Plate A6290900134

Product currently unavailable

Part no. A6421401263

Mercedes Exhaust EGR Diverter Valve W204 W212 W221 OM642 Diesel A6421401008

Product currently unavailable

Part no. 55566052

Opel Insignia A Astra J Diesel 2.0 Cdti EGR Exhaust Recirculation Valve 55566052

Product currently unavailable

Part no. 7794491

Exhaust Manifold BMW E60 E61 535d M57N Engine Exhaust Manifold 7794491D

Product currently unavailable

Part no. 06A131102H

Audi A3 8L TT 8N Mk1 VW Golf Mk4 IV EGR Valve 1.8 Petrol Engine 06A131102A

Product currently unavailable

Part no. A0009919770

Mercedes W203 W204 W211 W639 CDI Diesel Exhaust Clamp Pipe Bracket A0009919770

Product currently unavailable

Mercedes W164 W211 OM642 Diesel Exhaust EGR Cooler Valve A6421400775

-15%

Part no. A6421400775

Mercedes W164 W211 OM642 Diesel Exhaust EGR Cooler Valve A6421400775

Product currently unavailable

Part no. 8513691

BMW F20 F21 F30 F31 LCI EGR Cooler Exhaust Cooler Diesel B47 8596444 8513132

Product currently unavailable

Part no. 8200882195

Nissan Qashqai Renault Megane II 2.0 dCi Exhaust Gas Temperature Sensor

Product currently unavailable

Part no. 9661222280

Ford Focus Mk2 Turbo Heat Shield Insulation Cover 9661222280

Product currently unavailable

Part no. A2118300472

Mercedes C E S Class W203 W209 W211 W220 W221 Air Pollution Senor A2118300472

Product currently unavailable

Part no. 7130801

BMW E60 E60 E61 E61N LCi Heat Shield Insulation Tunnel Tank 7130801

Product currently unavailable

Part no. 8594612

BMW F31 335dX F32 435dX LCI N57Z Exhaust Muffler Mixer Centre System 8594612

Product currently unavailable

Part no. 5Q0253692B

Audi A4 A5 A6 A7 A8 Q5 Q7 Q8 S3 8Y Exhaust Flap Actuator Motor 5Q0253692B

Product currently unavailable

Part no. A9064921200

Exhaust Bracket Mercedes W906 OM651 Exhaust Holder To Transmission A9064921200

Product currently unavailable

Part no. 059131515EN

Audi SQ5 8R 3.0 TDI CGQB EGR Valve Cooler 059131515EQ

Product currently unavailable

Part no. A6541409000

EGR Valve Mercedes W205 W213 W447 OM654 Diesel Exhaust Cooler A6541409000

Product currently unavailable

Lambda Sensor Mercedes W164 W204 W211 Diesel CDI Oxygen Probe A0045427318

-15%

Part no. A0045427318

Lambda Sensor Mercedes W164 W204 W211 Diesel CDI Oxygen Probe A0045427318

Product currently unavailable

Part no. 04L131513B

Audi A5 8T EGR Valve Exhaust Recirculation Cooler 04L131513B

Product currently unavailable

VW Volkswagen Golf Mk8 Petrol Exhaust Lambda Oxygen Sensor 04E906262GH

-5%

Part no. 04E906262GH

VW Volkswagen Golf Mk8 Petrol Exhaust Lambda Oxygen Sensor 04E906262GH

Product currently unavailable

Part no. TP-CT10

Audi S4 B8 Exhaust Tips Akrapovic Muffler Pipes Set Carbon Fibre TP-CT/10

Product currently unavailable

Part no. 7823210-2

BMW F10 F11 F20 F21 F30 F31 F32 Engine EGR Exhaust Cooler 8476993

Product currently unavailable

Part no. 06F145701H-1

Audi A3 TT Volkswagen Golf Mk5 GTI 2.0 TFSI Turbo Exhaust Manifold 06F145701H

Product currently unavailable

BMW F20 F30 F32 N20 N26 Turbocharger Heat Resistant Shield Plate 7620956

-5%

Part no. 7620956

BMW F20 F30 F32 N20 N26 Turbocharger Heat Resistant Shield Plate 7620956

Product currently unavailable

Part no. 8200686637

Renault Master 2 2.5 dCi EGR Exhaust Valve Cooler Bracket Mount 8200686637

Product currently unavailable

Part no. 55355404

Opel Astra H 1.9 CDTI Exhaust Gas Temperature Sensor EGT Probe GM 55355404

Product currently unavailable

Part no. 7587130-2

BMW E81 E87 LCI E90 E91 E92 E93 Nox Sensor Petrol N43 7587130

Product currently unavailable

Part no. 1618LC-2

Peugeot Citroen Ford 1.6 HDi TDCi Diesel EGR Valve Gas Recirculation 1618LC

Product currently unavailable

Part no. 7520245-1

Mini Cooper R50 R52 Holder Clamp Upper Exhaust System Rear 7520245

Product currently unavailable

Part no. 9827225180

Citroen Relay 35L EGR Valve Diesel Engine Exhaust Cooler 9827225180

Product currently unavailable

Part no. 7807115

BMW F01 F02 Exhaust Muffler Support Mounting Bracket Holder Diesel 7807115

Product currently unavailable

Part no. 03P131512C

VW Volkswagen Polo 5 1.2 TDI Diesel EGR Exhaust Valve Cooler 03P131512C

Product currently unavailable

Part no. 059253034BQ

Audi SQ5 8R 3.0 TDI CGQB Gas Exhaust Manifold Right O/S 059253034BQ

Product currently unavailable

Part no. 7060661

BMW Series 5 E60 E60N E61 LCI Heat Insulation Bumper Rear Left N/S 7033718

Product currently unavailable

Part no. 2090000Q0K

Nissan Qashqai 1.5 dCi Gas Exhaust Turbo Charger Manifold 2090000Q0K

Product currently unavailable

Part no. 8K0133817B

Audi RS4 B8 4.2 FSI CFSA Petrol Air Filter Pipe Line Hose Tube 8K0133817B

Product currently unavailable

Part no. H82443150

Nissan Qashqai j10 Renault Koleos 2.0 dCi Exhaust Manifold H82443150 619895C

Product currently unavailable

Part no. A6561422000

Heat Shield Mercedes X164 Diesel Catalytic Converter Exhaust Cover A6561422000

Product currently unavailable

Part no. A2045241147

Mercedes W204 W207 A207 Strut Stiffening Brace Bar Underbody Support A2045241147

Product currently unavailable

Part no. A2464902300-1

Exhaust Pipe Mercedes W176 W246 OM651 Front Intake Manifold Line A2464902300

Product currently unavailable

Part no. 03G906262

Audi A3 8P Lambda Oxygen Exhaust Sensor Probe Cable TDI Diesel 03G906262

Product currently unavailable

Part no. 7806051

EGR Gas Cooler BMW E81 E82 E87 LCI 123d N47S Exhaust Manifold Cooler 7806051

Product currently unavailable

Part no. 7602845

Exhaust Tip BMW X3 F25 X4 F26 Exhaust Tailpipe Chrome Cover Trim 7602845

Product currently unavailable

Part no. 8595102

DPF Sensor BMW G20 G30 G12 B57 Diesel Particle Filter Oxygen Probe L=460 8595102

Product currently unavailable

Part no. A2711410940

Mercedes W204 W212 Air Pump Bracket Mount Holder M271 Petrol A2711410940

Product currently unavailable

Part no. 1473500QAF-1

EGR Cooler Nissan Qashqai Renault Dacia 1.5 dCi EGR Valve Cooler 1473500QAF

Product currently unavailable

Part no. CA2258A

Nissan Qashqai j10 Renault Koleos 2.0 dCi Breather Valve Heat Shield CA2258A

Product currently unavailable

Part no. 147109816R

Renault Trafic III 1.6 DCI EGR Valve Exhaust Unit Valeo 147109816R

Product currently unavailable

Part no. 03P906088A

VW Polo 5 Seat Ibiza 1.2 TDI CFWA Exhaust Gas Temperature Sensor EGT 03P906088A

Product currently unavailable

Part no. 7852405

Throttle Manifold BMW F90 M5 F91 M8 Connector Hose Petrol Engine 7852405

Product currently unavailable

EGR Cooler Mercedes W169 W245 EGR Valve Module OM640 Diesel A6400900154

-15%

Part no. A6400900154-1

EGR Cooler Mercedes W169 W245 EGR Valve Module OM640 Diesel A6400900154

Product currently unavailable

Part no. A6421420102

Mercedes W204 W207 W211 W639 OM642 Diesel Left N/S Exhaust Manifold A6421420102

Product currently unavailable

Part no. A1121400460-1

EGR Valve Mercedes W211 M112 Exhaust Gas Recirculation Emission A1121400460

Product currently unavailable

Part no. 8579973

BMW G20 G21 G30 G31 G32 Diesel Exhaust Gas Pressure Sensor 8579973

Product currently unavailable

Part no. 059253033BQ

Audi SQ5 8R 3.0 TDI CGQB Gas Exhaust Manifold Left N/S 059253033BQ

Product currently unavailable

Part no. A0009054704

NOX Sensor Mercedes W213 Lambda Oxygen Probe A0009054704

Product currently unavailable

Part no. 8514019

BMW F20 F21 F30 F31 LCI B47 Diesel Exhaust Gas Pressure Sensor 8514019

Product currently unavailable

Part no. 935093300

Kia Sportage 3 Hyundai ix35 1.7 CRDi Lambda Sensor Oxygen Probe 935093300

Product currently unavailable

Part no. 0281004174

VW Volkswagen Crafter 2.0 TDI Lambda Oxygen Exhaust Sensor Probe 0281004174

Product currently unavailable

Part no. A0009050008

Mercedes Vito W447 Diesel OM651 Nox Sensor Catalytic Converter SCR Probe

Product currently unavailable

Part no. A0009954033

Exhaust Clamp Mercedes W205 X253 C63 GL63 AMG Pipe Connector A0009954033

Product currently unavailable

Part no. 1412000Q0L

Nissan Qashqai Renault Dacia 1.5 dCi Diesel EGR Pipe Valve Line Hose 1412000Q0L

Product currently unavailable

Part no. 7823854

Lambda Probe Bracket BMW F10 F20 F30 N47S1 Plug Support Holder 7823854

Product currently unavailable

Exhaust Sensors Holder Mercedes W212 Petrol M276 System Holder Mount A2761507373

-5%

Part no. A2761507373

Exhaust Sensors Holder Mercedes W212 Petrol M276 System Holder Mount A2761507373

Product currently unavailable

Part no. A1769060501

Mercedes X156 W176 M133 Petrol Exhaust Flap Motor Actuator A1769060501

Product currently unavailable

Part no. 8587518

Bypass Valve BMW G01 G20 G30 B47 TurboCharger Charge Air Valve Housing 8587518

Product currently unavailable

...

Showing 1882-1980 of 2525 products

Reliable parts for exhaust systems and emission filters – perfect fit for your car

Durable exhaust components – for maximum performance and durability

Exhaust systems and exhaust aftertreatment systems are essential components of every modern vehicle. Their role is not only to reduce noise but, above all, to reduce harmful emissions, making driving more environmentally friendly and compliant with applicable standards. At Global Parts, you'll find a wide selection of used car parts. for exhaust and exhaust gas treatment systems, for brands such as BMW , AUDI , Volkswagen , Mercedes , Mini and others. The exhaust system in a typical passenger car operates at temperatures ranging from 200°C to as much as 800°C under high engine loads. Therefore, these components must be made of materials resistant to corrosion and temperature fluctuations, such as stainless steel or nickel alloys. A well-designed exhaust system not only protects the environment but also improves combustion efficiency, which can translate into fuel savings of up to 5–7% compared to a faulty system.

How does the exhaust and exhaust gas treatment system work?

Exhaust systems are advanced systems composed of many key components that work together to efficiently remove exhaust gases and reduce their harmful effects. The most important elements include:

Bypass valves – Controls exhaust gas flow, helping to optimize pressure in the exhaust system.

EGR valves and parts – They are responsible for exhaust gas recirculation, which reduces nitrogen oxide emissions and improves fuel combustion.
Secondary air pumps – They support the combustion process by supplying additional oxygen to the exhaust system, reducing exhaust emissions.
Catalysts – They purify exhaust gases by neutralizing harmful substances such as nitrogen oxides and carbon monoxide.
Exhaust systems and kits – Comprehensive exhaust system component kits ensuring optimal engine performance.
Collectors – They are responsible for discharging exhaust gases from the cylinders to further elements of the exhaust system.
Exhaust pipes and tips – They ensure efficient exhaust gas removal and give the vehicle a sporty appearance.
Clamps, clamps, flanges and mounting parts – Mounting elements enabling solid attachment of the exhaust system.
Mufflers and resonators – They reduce engine noise, improving driving comfort.
Exhaust system gaskets – They ensure tight connections and eliminate the risk of exhaust leaks.
Lambda probes and O2 sensors – They monitor exhaust gas composition, optimizing the fuel-air mixture and improving combustion economy.
Thermal shields, connectors and sleeves – They protect exhaust system components from overheating and improve their durability.
Solenoid valves – They regulate the flow of gases in the exhaust system, improving its efficiency. Each of these components is crucial for engine performance, driving comfort and environmental protection. For example, the diesel particulate filter (DPF) installed in diesel engines can trap up to 90% of the soot produced during combustion. In cars from brands such as Audi and BMW, DPF parameters are adapted to Euro 6 standards, which allow nitrogen oxide (NOx) emissions of just 80 mg/km. This demonstrates how precisely these systems must be designed to meet stringent regulations.

Why is it worth taking care of exhaust and exhaust gas treatment systems?

Regular maintenance and replacement of exhaust and exhaust aftertreatment system components is essential for efficient and environmentally friendly engine operation. Neglecting these systems can lead to:

Increased exhaust emissions, which may result in failure to pass the technical inspection.
Damage to key components such as catalytic converters or DPF filters.
Decreased vehicle performance and higher fuel consumption. At Global Parts we offer genuine used car parts , which undergo rigorous quality testing, ensuring reliability and durability. Taking care of your exhaust system isn't just about the environment, it's also about saving money. For example, a leaky muffler can increase fuel consumption by up to 0.5 l/100 km. With an annual mileage of 20,000 km, this translates to an additional 100 liters of fuel, a cost of several hundred zlotys.

How to choose the right parts for exhaust and exhaust gas treatment systems?

When choosing parts for the exhaust system and exhaust gas treatment systems, such as mufflers, catalytic converters or particulate filters, it is worth paying attention to:

Vehicle-specific fit – Every car make and model requires specific solutions. At Global Parts, you'll find exhaust and aftertreatment components perfectly matched to BMW , AUDI , Volkswagen , Mercedes , Mini, and more.
Technical condition – Make sure components are free from damage, corrosion and cracks.
Emissions Compliance – Ensure the parts you choose meet current emissions regulations.

To make the selection of parts easier, below is an example table of compatibility and wear symptoms.

Element	Typical signs of wear	Application/Compatibility
Silencer	louder engine operation, metallic vibrations	most BMW, Audi, VW models
DPF filter	power loss, engine error message	diesel engines, Euro 5 and Euro 6
Lambda probe	higher fuel consumption, uneven engine operation	all petrol and hybrid types
Catalyst	characteristic smell of exhaust fumes, loss of power	vehicles with emission standards from Euro 3 and above

Why choose used exhaust and exhaust aftertreatment system parts?

Used car parts This is an excellent solution that allows you to save money while maintaining high quality. By choosing used exhaust systems and exhaust aftertreatment parts, you gain:

Lower costs – Used components are much cheaper than new ones, but offer equally high quality.
Ecology – You support recycling and reduce the amount of automotive waste.
Wide selection – In our store you will find components for the most popular car brands.

How to take care of the exhaust system and exhaust gas treatment?

To ensure that your exhaust system and exhaust gas treatment system continue to function efficiently for years to come, it is important to remember a few rules:

Regularly check the condition of the DPF filter and catalytic converter - clogging them can reduce the vehicle's performance.
Keep exhaust pipes clean to avoid corrosion.
Avoid short journeys, which may cause the exhaust system and its components to underheat. In case of damage or wear, you will find the right used car parts at Global Parts that will restore full functionality of your exhaust system.

FAQ - Frequently asked questions about car exhaust systems

Question	Answer
What is the main purpose of the exhaust system?	The exhaust system is a system of pipes and components whose task is to remove and purify exhaust gases, reduce noise and support engine operation.
What does exhaust gas purification system mean?	It is a set of components, such as a catalytic converter, DPF filter and EGR valve, whose task is to reduce harmful chemical compounds in exhaust gases and meet emission standards.
What is a lambda probe used for?	The lambda sensor monitors the composition of the fuel-air mixture and sends data to the engine control unit, which allows for optimal combustion.
How to recognize catalytic converter damage?	Symptoms include a loss of engine power, a check engine light and a characteristic exhaust smell.
Does a DPF filter fit every diesel?	No, DPF filters vary in design and parameters. They must be matched to the make, model, and emissions standard (e.g., Euro 5, Euro 6).
How often should a muffler be replaced?	Under normal operating conditions, an exhaust muffler can last up to 80,000–120,000 km, but its durability depends on the quality of the materials and driving style.
Are the exhaust system parts used safe?	Yes, provided they are verified and come from a reliable source – just like in the Global Parts store, where each part undergoes quality control.

Summary: Exhaust Systems and Exhaust Gas Treatment at the Global Parts Automotive Store

Exhaust systems and exhaust aftertreatment systems are the foundation of modern vehicles, combining ecology, efficiency, and driving comfort. By maintaining their technical condition, you ensure reliability and compliance with applicable emission standards. The Global Parts automotive store invites you to browse our wide selection of original used car parts . Whether you're looking for car parts for BMW , Audi , Volkswagen , Mercedes, Mini , and others, you'll find them at competitive prices. We strive to ensure every customer finds the right parts for their car, and if you have any questions or concerns about selecting the right components, we're happy to help! Please contact us – we're here to help! For more information and interesting facts, visit our automotive blog .

used parts mercedes used car parts audi used car parts cheap car parts audi auto parts volkswagen genuine parts spare parts bmw exhaust & emission systems mercedes exhaust & emission systems mini exhaust & emission systems audi exhaust & emission systems volkswagen exhaust & emission systems