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

The Dinan D660-0050 Free Flow Axle-Back Exhaust delivers enhanced performance and an aggressive exhaust note for 2015-2020 BMW M3 and M4 models. This premium exhaust system adds 5 horsepower while producing a louder, sportier sound that transforms your driving experience.

Performance Features:

• +5 HP power gain over stock exhaust
• Twin secondary exhaust valves with 76mm diameter—45% less restrictive than OE valves
• Computer-controlled valves limit noise during low-speed driving and open fully during high-load conditions
• Drone abatement technology reduces unwanted cabin resonance
• 3 lbs lighter than stock exhaust system

Construction & Design:

• 100% 304 stainless steel construction for durability and corrosion resistance
• Quad 3.5-inch exhaust tips available in black ceramic coated or polished stainless finish with laser engraving
• Utilizes factory brackets and hangers for precise, factory-like fitment
• Reuses stock exhaust valve actuators for seamless integration

Smart Integration:

• Exhaust valve operation remains unchanged—adjust exhaust tone via M-Drive settings
• Retains full functionality of BMW's variable exhaust system
• Direct bolt-on installation using OEM mounting points

Engineered specifically for the F80 M3 and F82/F83 M4, this axle-back exhaust system combines performance gains with refined acoustics, giving you the power and sound you want without compromising daily drivability.