N55 4" Catless Downpipe – Fits BMW M135i M235i M2 335i 435i F20 F21 F22 F30 F32 F33 F87 (2013–2018, EWG Models Only)

Unlock the true performance of your N55-powered BMW with this 4" Race Downpipe, designed specifically for models equipped with the Electronic Wastegate (EWG) turbocharger (production 08/2013+). By replacing the restrictive factory catalytic converter, this downpipe delivers:

• Faster turbo spool and sharper throttle response

• Aggressive exhaust tone that brings the N55 engine to life

• Proven performance gains – +20–25hp with tuning

• Optimized airflow for higher boost and smoother power delivery

Constructed from mandrel-bent 304 stainless steel, this downpipe is built for long-term durability under extreme conditions. CNC-machined billet SS304 flanges ensure a leak-free seal, while precision TIG-welded joints provide strength and reliability.

Designed for both LHD and RHD applications, it bolts directly to OEM or most aftermarket exhaust systems, eliminating the need for cutting or modifications.

Why Choose This Downpipe?

• Best sound upgrade – deeper tone and louder turbo spool

• Performance proven – dyno-tested gains with tuning

• Durable build – stainless steel, TIG-welded, CNC flanges

• Direct fitment – installs using factory hardware

• EWG-specific design – ensures proper fit and compatibility

Technical Specs

• Diameter: Full 4.0" mandrel-bent tubing

• Material: 304-grade stainless steel

• Flanges: CNC-machined billet SS304

• Welding: Hand TIG-welded for strength and precision

• Performance: +20–25hp with proper tuning

• Fitment: Direct OEM/aftermarket exhaust compatibility

• Design: Race configuration (catalytic converter removed)

Vehicle Fitment (EWG Models Only, 08/2013+)

BMW 1 Series

• 2012–2018 M135i (N55, EWG only, production 08/2013+)

• 2012–2018 M135xi (N55, EWG only, production 08/2013+)

BMW 2 Series

• 2014–2016 M235i (N55, EWG only)

• 2014–2016 M235xi (N55, EWG only)

BMW 3 Series

• 2013–2016 335i (N55, EWG only, production 08/2013+)

• 2013–2016 335xi (N55, EWG only, production 08/2013+)

BMW 4 Series

• 2014–2016 435i (N55, EWG only)

• 2014–2016 435xi (N55, EWG only)

BMW M2

• 2016–2018 M2 (N55, EWG only)

Fitment Note

This downpipe is for Electronic Wastegate (EWG) models only.

• EWG: Features an electronic actuator on the lower passenger side of the engine, near the turbo.

• PWG: Uses a pneumatic actuator – not compatible with this downpipe.

Important Note

This product is intended for off-road and track use only. It is not legal for use on public roads and may not comply with emissions regulations. Please check local laws before purchase or installation.