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

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

OneFastShop SKU: N55FXDP
Price
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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 1 year warranty on defects.

Specifications

Diameter 4 inch (full diameter from turbo outlet)
Material 304 grade stainless steel, mandrel bent
Flanges CNC machined billet SS304
Welding Hand TIG welded
Mounting Welded bracket included
Configuration Catless (race), catalytic converter removed
Engine BMW N55 EWG (electronic wastegate)

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

Year Make Model Submodel Engine
2013-2015 BMW 3 Series 335i / 335i xDrive (F30/F31/F34) N55 EWG
2014-2016 BMW 4 Series 435i / 435i xDrive (F32/F33/F36) N55 EWG
2014-2016 BMW 2 Series M235i / M235i xDrive (F22/F23) N55 EWG
2016-2018 BMW M2 F87 (N55 only, NOT Competition / CS) N55 EWG

Shipping

  • Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
  • 5 stars: 5 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
J
Jeremy V.

Smooth install on my F30 335i. The 4-inch diameter is a real upgrade over the 3-inch piece I had before. Power gains on a tune are exactly as advertised, and rasp at cruise is minimal.

E
Eric F.

This worked well for my M235i. Install was direct and the exhaust tone became deeper without sounding cheap.

J
Jordan W.

Quality looked good for the price. Welds were consistent and the hanger position was where it should be on my car.

N
Nick P.

Installed on an F30 335i EWG and the fitment was clean. The v band area lined up without needing to force the pipe into place.

C
Colton Becker

Bolted up to my F22 M235i with EWG without any issues. Sound on cold start is aggressive, then mellows out once warm. Absolutely woke up the N55 paired with a JB4 and tune.

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