Dinan Free Flow Axle-Back Exhaust for 2018-2023 BMW M5 F90 - D660-0079

Give your 2018-2023 BMW F90 M5 a deeper, louder exhaust note while retaining factory-controlled valve functionality with the Dinan D660-0079 Free Flow Axle-Back Exhaust. Designed for the F90 M5, including listed Competition and CS applications, this performance exhaust is constructed from TIG-welded T304 stainless steel and features larger 83mm piping, twin secondary exhaust valves, and four massive 4-inch polished double-wall exhaust tips. The system is engineered to improve exhaust flow and reduce backpressure while maintaining a refined cabin environment during normal driving.

Dinan increases the exhaust tubing diameter from 80mm stock to 83mm and incorporates a muffler using absorption and reactive technologies to deliver a deeper, sportier exhaust note while reducing unwanted low-RPM drone. Factory computer-controlled exhaust valves and actuators are retained, so valve operation remains integrated with the M Drive settings. During high-load conditions, the valves open to allow greater exhaust flow and sound, while lower-speed operation remains more subdued.

Key Features & Specs:

• Brand: Dinan
• Series: Free Flow
• Product Type: Axle-Back Exhaust
• Part Number: D660-0079
• Fitment: BMW M5 / M5 Competition / M5 CS
• Chassis: F90
• Material: T304 Stainless Steel
• Body Material: T304 Stainless Steel
• Pipe Material: T304 Stainless Steel
• Construction: TIG-Welded
• System Finish: Brushed
• Tip Finish: Polished
• Exhaust Tip Quantity: 4
• Tip Diameter: 4 in / 102mm
• Tip Style: Straight-Cut, Double-Walled, Clamp-On
• Tip Branding: Laser-Engraved Dinan Logo
• Pipe Diameter: 83mm vs. 80mm stock
• Exhaust Valves: Factory computer-controlled valves retained
• Secondary Valves: Twin 76mm valves
• Valve Restriction: Dinan states the 76mm secondary valves are 30% less restrictive than OE valves
• Factory Valve Actuators: Reused
• M Drive Compatibility: Factory exhaust valve operation remains unchanged
• Sound: Louder, deeper, sportier exhaust tone
• Drone Control: Designed to reduce low-RPM cabin resonance
• Installation: Easy bolt-on installation
• Mounting Hardware: Included
• Clamps Included: Yes
• Hangers Included: Yes
• Labor Time: 2.4 hours
• Length: 50 in
• Width: 34 in
• Height: 13 in
• Weight: 63 lb
• Grade Type: Performance
• Dinan Point Value: 3
• Emission Code: 5
• UPC: 813725025063

Fitment:

• 2018-2023 BMW M5 - F90
• 2019-2023 BMW M5 Competition - F90
• 2022 BMW M5 CS - F90