Dinan D660-0050-BLK Free Flow Axle-Back Exhaust for BMW M3/M4

The Dinan Free Flow Axle-Back Exhaust system transforms your 2015-2020 BMW M3/M4 with enhanced performance and an aggressive exhaust note. This premium exhaust upgrade delivers a noticeable 5 horsepower gain while producing a sportier, more engaging sound that elevates the driving experience.

Performance Features:

• Adds 5 horsepower through reduced exhaust restriction
• Twin secondary exhaust valves with massive 76mm diameter—45% less restrictive than OE valves
• Computer-controlled valve system maintains quiet operation during low-speed driving, opens fully under high-load conditions
• Drone abatement technology minimizes unwanted cabin resonance
• 3 pounds lighter than the factory exhaust system

Construction and Design:

• 100% premium 304 stainless steel construction for durability and corrosion resistance
• Quad 3.5-inch exhaust tips with black ceramic coating and laser engraving
• Utilizes factory mounting brackets and hangers for OEM-quality fitment
• Reuses stock exhaust valve actuators for seamless integration
• Exhaust valve operation unchanged—adjust tone via M-Drive settings just like stock

This axle-back exhaust system is engineered specifically for the F80 M3 and F82/F83 M4 platform, delivering the perfect balance of performance, sound quality, and everyday drivability. The valve-controlled design allows you to enjoy an aggressive exhaust note when you want it, while maintaining civility for daily driving and residential areas.