Active Autowerke F3X 228i/328i/428i N20 GESI Downpipe

The Active Autowerke Signature N20 downpipe is for the four-cylinder F-chassis BMW 228i, 328i and 428i. It uses 3.5 in stainless piping and a 4 in GESI ultra high-flow catalytic converter to free up the exhaust right after the turbo.

Important: some of these cars have the N26 engine instead of the N20. This downpipe does not fit the N26, so please include your VIN with your order.

This variant includes a 4" ultra high flow GESI catalytic converter that will NOT produce a CEL GESi HO-Series Gen 2 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

The factory downpipe and cat are the biggest restriction after the turbo. Replacing them helps the N20 spool sooner and gives a tuned car more power, with a deeper exhaust note.

Materials and Construction

Full TIG-welded 304 stainless steel. The 400 cpsi catalyst uses a stainless substrate furnace-brazed to the mantle. Bolt-on, no cutting or welding.

Features

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

Specs

• Part number: 11-079
• Brand: Active Autowerke
• Type: catted downpipe
• Catalyst: GESI, 4 in, 400 cpsi
• Piping: 3.5 in
• Engine: BMW N20 2.0L turbo inline-four (not N26)
• Shipping weight (Active Autowerke): 25 lb (11.3 kg)

Fitment Notes

• N20 only: it will not fit the N26 engine. Send us your VIN and we will confirm.
• 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.

How do I know if I have an N20 or N26?
Send us your VIN and we will check before your order ships.