Active Autowerke F80 M3/F82 M4/M2C S55 GESI Downpipes

Active Autowerke builds this pair of S55 downpipes for the BMW F80 M3, F82 M4 and F87 M2 Competition. Each pipe carries a 4 in GESI G-Sport (Gen 2 Advanced) ultra high-flow catalytic converter, so you get much freer flow than stock while keeping a cat on each bank.

The S55 has two turbos, each with its own downpipe. The factory downpipes carry restrictive catalytic converters right after the turbos, which hold back flow and slow spool.

GESI HO-Series Gen 2 Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant, perfect for use on 1996 and newer vehicles. 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

Replacing both downpipes opens up the exhaust right where it matters most, at the turbo outlets. Lower back pressure helps the turbos spool sooner and lets a tuned S55 make more power. The sound also gets deeper and a little louder. These are a common first step before a tune.

Materials and Construction

TIG-welded 304 stainless steel with cast stainless upper V-band clamps for a precise fit. The 400 cpsi catalyst uses a stainless substrate furnace-brazed to the mantle for durability. They bolt on with no cutting or welding.

Features

• Pair of downpipes with 4 in GESI G-Sport Gen 2 high-flow cats
• 400 cpsi stainless catalyst substrate
• Cast stainless upper V-band for a precise fit
• TIG-welded 304 stainless steel
• Bolt-on, no cutting or welding

Specs

• Part number: 11-080
• Brand: Active Autowerke
• Type: catted downpipes (pair)
• Catalyst: GESI G-Sport Gen 2, 4 in, 400 cpsi
• Material: 304 stainless steel
• Engine: BMW S55 3.0L twin-turbo inline-six
• Shipping weight (Active Autowerke): 50 lb (22.7 kg)

Fitment Notes

• Active Autowerke also lists the 2020 M2 CS. Our vehicle filter does not include the M2 CS yet, so CS owners can order here directly.
• 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.

GESI or AFlow cats?
Both are high-flow catted downpipes from Active Autowerke. The GESI version uses GESI G-Sport cats; the AFlow version (11-080A) uses Active Autowerke's own cats at a lower price.