Dinan D660-0050 - Freeflow Axle-Back Exhaust

Dinan D660-0050 - Freeflow Axle-Back Exhaust

Dinan Free Flow Axle-Back Exhaust - 2015-2020 BMW M3/M4

Freeflow Axle-Back Exhaust; 304 Stainless Steel Construction; 5 Max Horsepower Gain; Quad 3.5 in. Laser Engraved Polished Tips w/Logo; Includes Mounting Hardware;

Dinan 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 quad tips. Every Dinan product is designed and tested in Morgan Hill, California.

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