Active Autowerke BMW N55 Catted Downpipe for F-Chassis M2, M235i, 335i, 435i
Unlock faster spool, stronger mid-range and a sharper throttle response on your BMW N55 with the Active Autowerke catted downpipe. Built from 304 stainless steel with a huge 4.5 inch GESI high flow catalytic converter and 3.5 inch piping, this is the go-to BMW N55 downpipe upgrade for F30 335i, F32 435i, F87 M2 and F22 F23 M235i owners who want power and quality without a check engine light.
At Nforcd we have installed and run this AA N55 downpipe ourselves and customers have been consistently impressed by the precise fit, top tier welds and CEL-free performance. If you are searching for BMW N55 catted downpipe, BMW M2 catted downpipe, BMW 335i downpipe, BMW 435i downpipe, F30 downpipe, F32 downpipe, F87 downpipe or Active Autowerke downpipe UK, this is the proven, emissions-friendly, high flow choice.
Why choose the Active Autowerke N55 catted downpipe
Turbochargers thrive on low back pressure. The restrictive factory cat and pipe slow exhaust flow and delay spool. Active Autowerke’s 3.5 inch Signature design minimises bends, maximises flow and keeps durability high. The GESI G-Sport Ultra High Output catalyst is OBD2 compliant and EPA certified in 49 states, so you get the performance benefits of a high flow cat with excellent emissions control and no dashboard warnings.
- No CEL when using this downpipe
- GESI UHO high flow 4.5 inch catalyst with 3.5 inch piping for maximum flow
- OBD2 compliant and EPA registered in 49 states
- Quicker turbo spool and improved power over stock
- Rated for 500 to 850 hp applications and withstands up to 1500°F
- Reaches operating efficiency within seconds of start-up
- Bolt-on fitment to the OEM location with no cutting or welding
- TIG-welded 304 stainless steel throughout, including the catalyst substrate
- Ultra high flow 400 CPSI catalyst, modular design and precise fitment
- Engineered and made in Miami, Florida by Active Autowerke
Real-world benefits
Expect faster turbo response, stronger pull through the rev range and a more purposeful exhaust tone while keeping emissions in check. The reduced back pressure helps your N55 breathe, supporting future upgrades and mapping while retaining daily drivability.
Compatibility
BMW models with the N55 engine:
- 1 Series
- F20 F21 M135i and M135ix
- 2 Series
- F22 F23 M235i and M235ix
- F87 M2 N55
- 3 Series
- F30 F31 335i and 335ix
- 4 Series
- F32 F33 F36 435i and 435ix
Fitting and support
Professional installation recommended. Nforcd offers fitting at our workshop in Warwickshire. To request a quote or book in, email Sales@nforcd.com.
Part number
11-040
Legal and warranty
EPA certified for OBD2 vehicles except in California. Not legal for vehicles registered in the state of California. GESI catalytic converter covered by a 5 year or 50,000 mile warranty.
Popular search terms
BMW N55 catted downpipe UK, Active Autowerke N55 downpipe, AA N55 downpipe, BMW M2 catted downpipe, BMW M235i downpipe, BMW 335i downpipe F30, BMW 435i downpipe F32, F87 M2 downpipe, F30 F32 F87 catted down pipe, GESI catted downpipe N55, no CEL N55 downpipe, stainless steel BMW downpipe, high flow catalytic converter BMW N55, performance exhaust upgrade BMW 335i 435i M2 M235i.