• Quad 3.5 in. Tips
• Mounting Hardware

The Dinan D660-0050-BLK Free Flow Axle-Back Exhaust enhances the factory soundtrack of the BMW M3 and M4 with a refined and aggressive tone. Built from 100% T304 stainless steel, the system uses computer-controlled valves to adapt sound levels based on driving conditions while improving overall flow and reducing drone. The system installs with factory brackets and hangers for a seamless fit and includes quad 3.5 in. laser engraved exhaust tips for a bold appearance.

Dinan D660-0050-BLK Free Flow Axle-Back Exhaust Features:

• More Power: +5 HP
• Drone Abatement Technologies Used to Reduce Cabin Resonance
• Enjoyably Louder, Sportier Sound
• Quad 3.5 in. 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 Actuators Are Reused
• Exhaust Tone Adjustable via M-Drive Settings
• Dinan Exhaust is 3 lbs Lighter Than Stock
• Twin Secondary Exhaust Valves with 76mm Diameter – 45% Less Restrictive Than OE Valves
• 100% 304 Stainless Steel Construction
• Uses Factory Brackets and Hangers for Factory-Like Fitment

Emissions Note:

This part is legal for sale or uses on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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