Dinan Free Flow Axle-Back Exhaust for 2015-2020 BMW M3/M4 - D660-0050-BLK

Give your F8x BMW M3 or M4 a louder, sportier exhaust note and distinctive quad-tip appearance with the Dinan D660-0050-BLK Free Flow Axle-Back Exhaust. Designed for select 2015-2020 BMW M3 and M4 applications on the F80, F82, and F83 chassis, this performance exhaust is constructed from T304 stainless steel and finished with four 3.5-inch black ceramic coated, laser-engraved exhaust tips. Dinan reports a gain of up to 5 HP while reducing system weight by approximately 3 lb compared with stock.

The Dinan Free Flow system is engineered to increase exhaust flow while limiting unwanted cabin resonance. Factory computer-controlled exhaust valve functionality is retained, allowing quieter operation during low-speed driving and increased flow and sound under higher-load conditions. The stock exhaust valve actuators are reused, and exhaust valve operation remains compatible with the vehicle's M Drive settings. Twin 76mm secondary exhaust valves are also incorporated, which Dinan states are 45% less restrictive than the factory valves.

Key Features & Specs:

• Brand: Dinan
• Series: Free Flow
• Product Type: Axle-Back Exhaust
• Part Number: D660-0050-BLK
• Fitment: BMW M3 / M4
• Chassis: F80 / F82 / F83
• Material: T304 Stainless Steel
• Body Material: T304 Stainless Steel
• Pipe Material: T304 Stainless Steel
• System Finish: Brushed
• Tip Finish: Black Ceramic Coated
• Exhaust Tip Quantity: 4
• Tip Diameter: 3.5 in
• Tip Style: Quad, Laser Engraved
• Maximum HP Gain: +5 HP
• Weight Reduction: Approximately 3 lb lighter than stock
• Exhaust Valves: Twin 76mm secondary valves
• Valve Restriction: Dinan states the 76mm valves are 45% less restrictive than OE valves
• Valve Control: Factory computer-controlled operation retained
• M Drive Compatibility: Exhaust valve operation remains adjustable through factory M Drive settings
• Factory Valve Actuators: Reused
• Sound: Louder, sportier exhaust tone
• Drone Control: Drone-abatement technology designed to reduce cabin resonance
• Installation: Uses factory brackets, hangers, and mounting points
• Clamps Included: Yes
• Hangers Included: Yes
• Labor Time: 1.8 hours
• Length: 50 in
• Width: 34 in
• Height: 12 in
• Weight: 56 lb
• Grade Type: Performance
• Dinan Point Value: 3
• Emission Code: 5
• UPC: 813725021874

Fitment:

• 2015-2018 BMW M3 - F80
• 2015-2020 BMW M4 - F82 / F83
• 2019-2020 BMW M4 CS
• 2016 BMW M4 GTS