Downpipe For BMW B58 F2X m140i m240i F3X m340i m440i Series GESI Sportcat

Unleash the hidden performance of your BMW B58 engine with the Active Autowerke GESI Sportcat Downpipe. Engineered to overcome restrictive factory components, this high-flow downpipe dramatically improves exhaust flow, reduces backpressure, and enhances turbo efficiency. The result? Faster spool, sharper throttle response, increased horsepower, and a more engaging drive every time you hit the road.

Built with GESI’s EPA-registered high-flow catalytic converter, this downpipe provides the perfect balance of performance and compliance — delivering exhilarating power gains without triggering check engine lights. With its TIG-welded 304 stainless steel construction, precise V-band fitment, and ultra-durable 400-cell catalyst, this system is made to perform under extreme conditions while maintaining long-term reliability.

Features

• Fitment: BMW B58 F2X M140i, M240i / F3X M340i, M440i Series

• Catalyst: GESI EPA-registered high-flow sport cat; fully OBD2 compliant

• Construction: TIG-welded 304 stainless steel with furnace-brazed substrate for maximum durability

• Piping: 4.5” diameter tubing for unrestricted exhaust flow and power gains

• Turbo Response: Faster spool and sharper throttle feel

• Power Rating: Supports 500–850 hp applications

• Temperature Rating: Withstands up to 1500°F

• Technology: GESI proprietary precious metal loading reduces emissions while maintaining performance

• Installation: Direct bolt-on; no cutting or welding required

• Efficiency: Reaches operational efficiency within 9 seconds of startup

• Sound & Safety: Deep, refined tone with reduced harmful emissions — safe for drivers and passengers

• Compliance: EPA compliant for OBD2 vehicles (1996+), not for use in California