Active Autowerke GESI Ultra High Flow Cats Upgrade – BMW M3 (E9x)

OVERVIEW

Active Autowerke's GESI G-Sport cats upgrade is a set of connecting pipes for their Signature Track Pipe with X-Pipe on the BMW E9X M3, for the owner who already runs that pipe and wants to clear the check engine light without resorting to a tune while still meeting emissions requirements as specified by the EPA. Fitting most aftermarket exhaust systems and mufflers, it bolts on with no cutting, welding or modification and improves on the factory design through the X-pipe's scavenging effect, at 25 lbs against the factory system's 40 lbs. GESI's proprietary precious-metal loading technology greatly reduces emissions and eliminates most check engine lights, so these high-flow converters outperform stock units.

SPECS

• Two 4-inch GESI G-Sport Ultra High Output catalytic converters
• Ultra high flow 400 cell-per-square-inch catalyst
• No CEL when using this pipe
• Increase of 10+ RWHP when added to the BMW stock exhaust
• 12+ RWHP measured on the Active Autowerke Mustang chassis dyno when added to the Active Autowerke Signature exhaust system
• Rated for 300 to 500 hp per cat
• Withstands up to 1500°F
• Reaches operational efficiency within 9 seconds of startup
• Durable construction from TIG-welded 100% 304 stainless steel
• 304 stainless steel substrate furnace-brazed to the mantle for durability
• Cast upper stainless steel V-band for precise fitment
• Bolts on with factory-style flanges — no cutting or welding required
• Weighs less than 30 lbs versus the factory assembly at more than 40 lbs
• GESI EPA registered, fully OBD2 compliant for 1996-and-newer vehicles, except in California and other CARB states
• One year standard Active Autowerke warranty on exhaust products
• Catalytic converter warranty: 5 years / 50,000 miles on the shell and tube ends and 2 years / 25,000 miles on the catalytic core, original purchaser only; void if the car has excessive burble (louder than stock)
• Made in Miami, Florida

PARTS INCLUDED

• Two 4-inch GESI G-Sport Ultra High Output catalytic converters with connecting pipes
• Cast upper stainless steel V-band

TECH RESOURCES

Additional Parts Required

• Active Autowerke Signature X-Pipe for BMW E9X M3 (11-017) — this product is a cats upgrade for the Signature Track Pipe with X-Pipe. You must already own, or buy alongside it, the Signature X-Pipe it connects to.

Installation

• Active Autowerke — Catalytic Converter Break-In Instructions (PDF) — follow this procedure on new cats to avoid a check engine light appearing 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 Section 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 are not adversely affected. There is no mention or reference to cell density or converter volume dimension. The GESI catalytic converter will produce emissions that will meet the standards set by the EPA, not CARB.

PART NUMBER

• 11-083

VEHICLE APPLICATIONS