2015-2020 BMW M3 / M4 Dinan Freeflow Axleback Exhaust System - Black 660-0050-BLK

Dinan's Free Flow axle-back exhaust system features 100% stainless steel construction measured to exact specifications to ensure proper fit via factory hangers and mounting points. Dyno tuned for maximum exhaust flow with minimum backpressure, this system is designed to provide a more aggressive sound under acceleration, while reducing drone inside the vehicle, thanks to computer-controlled valves that limit noise during low-speed driving and open fully during high-load conditions to allow free flow. The exhaust gasses exit through larger laser engraved polished, or ceramic black, quad tips.

• Computer controlled valve limits noise during low speed driving; valve opens fully during high-load conditions to allow free flow
• Twin secondary exhaust valves with a whopping 76mm diameter, making them 45% less restrictive than the OE valves.
• Operation of exhaust valve is unchanged so exhaust tone can be adjusted via the M-Drive settings.
• Quad 3.5" black ceramic coated, or polished stainless, laser engraved exhaust tips
• Uses the factory brackets and hangers for a factory-like fitment
• Drone abatement technologies used to reduce cabin resonance
• Dinan exhaust is 3 lbs lighter than stock
• Stock exhaust valve actuaters are reused
• 100% 304 stainless steel construction
• Enjoyably louder, sporter sound
• More Power: +5 HP