BMW N55 EWG 4 Inch Catless Downpipe - 335i 435i M235i M2 2013-2018 - OneFastShop

Take the restriction out of your N55 with the OneFastShop 4 inch catless downpipe. The factory catalytic converter sits right off the turbo and is the single biggest choke point in the exhaust - removing it frees up real power, spools the turbo sooner, and opens up the deeper note the N55 was built to make. Engineered for N55 engines with the electronic wastegate (EWG) turbo.

Expect +20 to +30 horsepower with a supporting tune (more on upgraded turbos), faster spool, and sharper throttle response. It's a direct bolt-on with no cutting required, works with OEM and aftermarket cat-back exhausts, and is backed by a lifetime warranty on defects.

Specifications

What's in the Box

• 1x N55 4 inch catless downpipe
• Welded mounting bracket

Installation & Tuning Notes

Wastegate type: This downpipe fits N55 engines with the electronic wastegate (EWG) turbo only. EWG turbos have a small electric motor mounted on the turbocharger that controls wastegate position; PWG turbos use a vacuum line and diaphragm. The EWG replaced the PWG on N55 engines starting in mid 2013. If your N55 is from a 2011 to mid 2013 vehicle, you likely have a PWG turbo and need our N55 PWG downpipe instead.

Gasket required: A turbo-to-downpipe gasket is required to seal the downpipe to your factory turbo. Our 4 Inch Turbo to Downpipe Gasket for BMW N55 is sold separately - add one to your order.

Tuning & check engine light: Removing the cat means the rear O2 sensor will eventually set a check engine light (a catalyst efficiency code such as P0420) on an otherwise stock car. This is normal for any catless downpipe and not a fault with the part. To run it correctly and keep the light off, the car should be tuned with the rear O2 sensor turned off - any major N55 tuning platform supports this. We strongly recommend installing this downpipe with a supporting tune rather than on a stock vehicle.

Off-road use: Intended for off-road and track use only. Not legal for use on public roads and may not comply with emissions regulations. Check local laws before installation.

Fitment