BMW M4 Performance Exhaust - Dinan Axleback Free Flow (Polished), 2015–2020. A precision-built stainless system that sharpens exhaust tone while preserving daily comfort.

Made from 100% 304 stainless and measured for factory hangers, this axle-back is dyno tuned to reduce backpressure and deliver a richer, sportier note. Twin computer-controlled 76 mm valves keep volume civil at cruise and open under load for true free flow. Drone-abatement strategies minimize cabin resonance, and laser-engraved polished quad 3.5 in. tips finish the system. Reuses the stock valve actuators and is about 3 lb lighter than OE.

Features

• 100% 304 stainless steel construction
• Polished 3.5 in. laser-engraved quad tips
• Twin 76 mm valves; OE M-Drive control retained
• Dyno tuned for freer flow; drone reduction built in
• Manufacturer-rated gains up to +5 hp

Questions or ready to schedule? Call our Austin, Texas or Los Angeles, California area teams—we install and customize at both locations: TX 512-982-9393, CA 562-981-6800. Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov