The BMW N55 remains one of BMW's most versatile turbocharged inline-six engines, and the right exhaust upgrades can unlock even more of its performance potential.

For owners of 2014+ BMW models equipped with the N55 engine and electronic wastegate (EWG) turbocharger, we've developed the MAD N55 EWG Catless Downpipe. Designed specifically around these applications, this new downpipe replaces the restrictive factory catalytic converter with an unrestricted catless design that improves exhaust flow and gives the N55 a more aggressive character.

Whether you're building a tuned 535i, 640i, 740i, X5, or X6, the MAD Catless Downpipe is a straightforward way to reduce restriction immediately after the turbocharger.

Reduce Restriction After the Turbo

The factory catalytic downpipe is designed to meet emissions requirements and control exhaust output, but it also creates restriction directly after the turbocharger.

Replacing it with a catless downpipe provides a significantly freer-flowing exhaust path.

The MAD N55 EWG Catless Downpipe is designed to:

• Reduce exhaust restriction
• Improve exhaust flow
• Support increased airflow from the turbocharger
• Sharpen turbocharged engine response
• Enhance the overall exhaust character
• Support performance-focused N55 builds

For enthusiasts already running an ECU tune or other supporting modifications, reducing restriction in the exhaust system can be an important part of building a more capable N55 setup.

Developed Specifically for EWG N55 Applications

Not every N55 uses the same wastegate configuration, which makes verifying your turbocharger setup particularly important.

The MAD downpipe is specifically designed for electronic wastegate (EWG) N55 applications. Its application-specific design incorporates the correct layout for the supported BMW chassis while providing factory-style provisions for sensors and mounting.

Before ordering, verify that your vehicle is equipped with an electronic wastegate.

The wastegate is located on top of the turbo manifold on the left side of the engine. If you're unsure which configuration your BMW uses, send MAD a photo of your wastegate so we can confirm compatibility before you order.

More Exhaust Flow, More N55 Character

Removing the factory catalytic restriction doesn't just change how the exhaust gases move—it also changes the sound of the vehicle.

The MAD Catless Downpipe gives the N55 a more aggressive exhaust note, allowing more of the turbocharged inline-six's character to come through.

Combined with an aftermarket exhaust system, the change can become even more pronounced, giving your BMW a louder and more performance-oriented exhaust personality.

Purpose-Built Construction

The MAD N55 EWG Catless Downpipe features an application-specific design rather than universal tubing adapted to multiple vehicles.

Key construction details include:

• Formed exhaust tubing
• Welded construction
• Integrated flex section
• Factory-style sensor provisions
• Factory-style mounting provisions
• MAD identification plate

The integrated flex section allows the exhaust system to accommodate normal engine and exhaust movement while maintaining a secure connection.

Direct, Purpose-Built Upgrade

The MAD N55 EWG Catless Downpipe is designed as a direct upgrade for the supported BMW applications, making it an ideal choice for enthusiasts looking to replace the restrictive factory catalytic downpipe with a freer-flowing alternative.

Its application-specific fitment means you don't have to compromise with a universal solution or fabricate components to make the system work.

BMW N55 EWG Fitment

The MAD Catless Downpipe fits the following applications when equipped with the N55 electronic wastegate turbocharger:

• 2014+ BMW 535i (F10) — N55 EWG
• 2014+ BMW 640i (F06/F12/F13) — N55 EWG
• 2014–2015 BMW 740i & 740Li xDrive (F01/F02) — N55 EWG
• 2014+ BMW X5 (E70) — N55 EWG
• 2014+ BMW X6 (E71) — N55 EWG

Important Fitment Note

Please verify your vehicle has an electronic wastegate before ordering.

The wastegate is located on top of the turbo manifold on the left side. If you are unsure which configuration your vehicle has, contact MAD with a photo of your wastegate and we'll help confirm fitment.

Built for the N55 Enthusiast

The N55 platform continues to offer an excellent combination of performance, drivability, and tuning potential. Reducing exhaust restriction is one of the fundamental upgrades for enthusiasts looking to build on that foundation.

The MAD N55 EWG Catless Downpipe provides a freer-flowing path after the turbocharger, an application-specific fit, and a more aggressive exhaust character—all in a purpose-built package for supported EWG-equipped BMWs.

Whether you're starting your N55 build or upgrading an existing setup, the MAD downpipe is designed to help you get more out of the platform.

Emissions Disclaimer

This catless downpipe is intended for off-road, race, or closed-course competition use only where such modifications are permitted. It is not intended for use on pollution-controlled vehicles operated on public roads.

Removing the factory catalytic converter may violate federal, state, or local emissions laws. Customers are responsible for ensuring that their vehicle and modifications comply with all applicable regulations.

Please check your local laws before purchasing or installing this product.

Shop the New MAD BMW N55 EWG Catless Downpipe

Ready to reduce exhaust restriction and give your N55 a more aggressive exhaust character?

Learn more and order: https://mad-us.com/mad-bmw-n55-535-f10-f11-f07-640-f12-f13-740-f01-f02-x5-x6-2014-ewg-catless-downpipe/