Active Autowerke F3X M235i/335i/435i N55 GESI Downpipe

The Active Autowerke Signature N55 downpipe replaces the factory part on the BMW F22 M235i, F30 335i, F32 435i and the 2016-2018 F87 M2. It uses 3.5 in stainless piping and a 4.5 in GESI high-flow catalytic converter, so you get far more flow while keeping a cat.

The single-turbo N55 in the F-chassis 3 and 4 Series, the M235i and the first M2 is held back by the factory downpipe and its restrictive cat.

This variant includes a 4.5" high flow GESI catalytic converter that will NOT produce a CEL GESi UHO-Series Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant. GESi proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Lights". Say goodbye to Check Engine Lights and failed emissions tests! Please Note: These catalytic converters are not legal for use on vehicles registered in the state of California as a result of California Vehicle Code Section 27156 and 38391. NO CEL when using this downpipe GESI EPA registered high flow and fully OBD2 compliant EPA compliant for use on OBD2 vehicles (1996 and newer) except in California

What It Does

Swapping the downpipe frees up the exhaust at the turbo, which helps it spool sooner and lets a tuned N55 make more power. Expect a deeper note and a bit more turbo sound.

Materials and Construction

TIG-welded 304 stainless steel throughout. The 400 cpsi catalyst uses a stainless substrate furnace-brazed to the mantle. It bolts on with no cutting or welding.

Features

• 4.5 in GESI high-flow cat with 3.5 in piping
• 400 cpsi stainless catalyst substrate
• Full TIG-welded 304 stainless steel
• Bolt-on, no cutting or welding

Specs

• Part number: 11-040
• Brand: Active Autowerke
• Type: catted downpipe
• Catalyst: GESI, 4.5 in, 400 cpsi
• Piping: 3.5 in
• Engine: BMW N55 3.0L turbo inline-six
• Shipping weight (Active Autowerke): 30 lb (13.6 kg)

Fitment Notes

• Active Autowerke says this downpipe fits F-chassis N55 cars built from 09/2013 onward only. Early 2012-2013 335i cars (built before 09/2013) may not fit, so check your build date or send us your VIN.
• 5 Series N55 cars need a different model; contact us.
• Active Autowerke covers the shell and tube ends for 5 years / 50,000 miles and the catalyst core for 2 years / 25,000 miles, for the original buyer. The warranty is void if the car runs excessive burble (more than stock), because that physically destroys the catalyst core.
• Active Autowerke states fitment for US-model cars only.
• Questions before you order? Call or text (310) 231-0292 or email Online@AutoTalent.com.
• Shop all Active Autowerke downpipes, every catted downpipe we carry, or the full Active Autowerke range.

FAQ

Is this a catless downpipe?
No. It has a high-flow catalytic converter built in.

Do I need a tune?
A tune is recommended to get the most from any downpipe. Ask us if you are unsure which tune suits your car.

Does it fit the 2016-2018 M2?
Yes. Active Autowerke lists the F87 M2 with the N55. The 2019-2021 M2 Competition (S55) uses the S55 downpipes.