IRL G8X 3”-3.5” MaxFlow Race Downpipes

Unlock the full potential of your S58-powered BMW with the IRL 3.5” MaxFlow Race Downpipes. Designed and engineered for enthusiasts demanding maximum performance, these downpipes eliminate the restrictive factory catalytic converters and feature a true 3.5-inch mandrel-bent design for exceptional exhaust flow, faster turbo spool, and increased horsepower and torque. Unlike smaller diameter alternatives, the IRL MaxFlow design minimizes backpressure while maintaining smooth exhaust velocity, allowing your turbos to operate more efficiently. The result is improved throttle response, reduced turbo effort, and an aggressive motorsport-inspired exhaust note that perfectly complements the S58 engine. Each set is precision TIG welded from premium T304 stainless steel and engineered for a direct bolt-on installation using factory mounting locations. Designed to pair seamlessly with both the OEM exhaust and aftermarket cat-back systems, these race downpipes deliver uncompromising performance for street and track applications where emissions compliance is not required. Features True 3.5” MaxFlow mandrel-bent design Premium T304 stainless steel construction Precision TIG welded for maximum durability Increased horsepower and torque potential Faster turbo spool and improved throttle response More aggressive exhaust tone with enhanced turbo sound Direct bolt-on installation with OEM-style fitment Compatible with factory and most aftermarket exhaust systems Vehicle Fitment BMW G80 M3 BMW G81 M3 Touring BMW G82 M4 Coupe BMW G83 M4 Convertible All S58-powered models (2021+) For Off-Road/Racing Use Only: These race downpipes remove the factory catalytic converters and are intended for closed-course competition vehicles only. A check engine light (CEL) is expected on factory engine calibrations. ECU tuning is recommended to maximize performance and optimize operation.