OVERVIEW

BMW introduced a new valvetronic, single-turbo version of its direct-injection engine for the F-chassis models beginning in 2012, and its restrictive factory downpipe slows exhaust flow and turbo spool. The Active Autowerke F-chassis N55 Signature downpipe for the M235i, 335i, 435i and M2 uses 3.5 inch stainless steel piping, designed to be as unrestrictive as possible for more power, quicker spool and extreme durability. This variant carries a 4.5 inch high-flow GESi G-Sport Ultra High Output catalytic converter, built in full 304 stainless including the substrate, EPA registered and compliant in 49 states, whose precious metal loading keeps emissions low at high flow so no check engine light or failed emissions test results.

SPECS

3.50 inch diameter piping
4.50 inch high flow GESi G-Sport catalytic converter, 400 cells per square inch
Rated for 500 to 850 hp applications
TIG welded, full 304 stainless steel construction
304 stainless steel catalyst substrate, furnace brazed to the mantle for durability
Modular design for later upgrades
Withstands temperatures up to 1500 F
Reaches operational efficiency within 9 seconds of startup
EPA registered, fully OBD2 compliant for 1996 and newer vehicles, except in California
Suited to forced induction applications with no loss of horsepower
Bolts on with no cutting or welding required
Made in Miami, Florida
Covered by a 5 year / 50,000 mile warranty on the catalytic converter

PARTS INCLUDED

Complete downpipe assembly as supplied by Active Autowerke; see the installation instructions for the full bill of materials.

TECH RESOURCES

Additional Parts Required

None. Active Autowerke specifies no additional hardware for this downpipe; it bolts on with no cutting or welding required.
Installer supplies basic hand tools and a lift or jack stands.

Installation

Active Autowerke catalytic converter break-in instructions (PDF) — follow this procedure on first start-up to avoid a check engine light being set in error
Active Autowerke installation instruction library

Notes

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 Sections 27156 and 38391.
Note: Federal law prohibits the tampering of an emissions control device. Mobile Source Enforcement Memorandum 1A allows for aftermarket parts to be used in the repair or replacement of emissions control systems, provided the emissions aren't adversely affected. There is no mention or reference to cell density or converter volume dimension. The GESi catalytic converter will produce emissions that meet the standards set by the EPA, not CARB.
Active Autowerke states this downpipe fits all F-chassis N55 cars from a 09/2013 build date and up only. Check your car's build date, not just its model year. Fitment applies to US-model cars only; confirm fitment with Speed Logic before ordering.

PART NUMBER

11-040

VEHICLE APPLICATIONS

Make	Model	Chassis	Engine	Years
BMW	M235i	F22	N55 3.0L Turbo I6	2014–2016
BMW	335i	F30 / F31 / F34	N55 3.0L Turbo I6	2014–2015
BMW	435i	F32 / F33 / F36	N55 3.0L Turbo I6	2014–2016
BMW	M2	F87	N55 3.0L Turbo I6	2016–2017