Take the restriction out of your N55 with the OneFastShop 3.5 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. Built for the big body N55 PWG chassis (F10 535i, F07 GT, F12/F13/F06 640i, F01 740i, E70 X5, E71 X6) from 2009 to 2014.
Expect +25 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.
| Diameter | 3.5 inch (full diameter from turbo outlet) |
| Material | 304 grade stainless steel, mandrel bent |
| Flanges | CNC machined billet |
| Welding | Hand TIG welded |
| Mounting | Welded bracket included |
| Configuration | Catless (race), catalytic converter removed |
| Engine | BMW N55 PWG (pneumatic wastegate, big body chassis) |
Wastegate type: This downpipe fits N55 engines with the pneumatic wastegate (PWG) turbo only - the big body chassis listed below. PWG turbos use a vacuum line and diaphragm. If you have a later N55 with the electronic wastegate (EWG), this downpipe is not compatible.
Gasket required: A turbo-to-downpipe gasket is required to seal the downpipe to your factory turbo. Our 3.5 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.
| Year | Make | Model | Submodel | Engine |
|---|---|---|---|---|
| 2011-2013 | BMW | 5 Series | 535i / 535i xDrive (F10) | N55 PWG |
| 2010-2014 | BMW | 5 Series GT | 535i GT / 535i xDrive GT (F07) | N55 PWG |
| 2012-2014 | BMW | 6 Series | 640i / 640i xDrive Coupe (F13) | N55 PWG |
| 2012-2014 | BMW | 6 Series | 640i / 640i xDrive Convertible (F12) | N55 PWG |
| 2013-2014 | BMW | 6 Series | 640i / 640i xDrive Gran Coupe (F06) | N55 PWG |
| 2011-2014 | BMW | 7 Series | 740i / 740Li / 740Li xDrive (F01/F02) | N55 PWG |
| 2011-2013 | BMW | X5 | xDrive35i (E70) | N55 PWG |
| 2011-2014 | BMW | X6 | xDrive35i (E71) | N55 PWG |
