Active Autowerke GESI Catted Downpipe – BMW M235i / 335i / 435i / M2 (N55, F2x / F3x / F87)

OVERVIEW

BMW introduced a new Valvetronic, single-turbo version of its direct-injection engine for the F-chassis models 2014 and up, 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
• Warranty: 5 years / 50,000 miles on the shell and tube ends; 2 years / 25,000 miles on the catalytic core; original purchaser only; void if the car has louder-than-stock (excessive) burble

PARTS INCLUDED

• Active Autowerke N55 Signature catted downpipe (catted downpipe only) — 3.5 inch 304 stainless piping with 4.5 inch GESi G-Sport catalytic converter

TECH RESOURCES

Additional Parts Required

• None. Active Autowerke specifies no additional hardware for this downpipe; it bolts on with no cutting or welding required, and no performance tune is needed.
• 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
• Professional installation recommended.
• Request an Install Appointment

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