Dinan Free Flow Axle-Back Exhaust for 2018-2023 BMW M550i xDrive - D660-0075

Give your 2018-2023 BMW G30 M550i xDrive a deeper, sportier V8 exhaust note while retaining factory-controlled valve operation with the Dinan D660-0075 Free Flow Axle-Back Exhaust. Constructed from T304 stainless steel, this performance exhaust features four massive 4-inch polished, double-wall clamp-on tips and is engineered to improve exhaust flow by reducing backpressure. Dinan reports gains of up to 8 HP and 6 lb-ft of torque at 6,600 RPM while incorporating drone-abatement technology to help maintain a refined cabin during normal driving.

The factory computer-controlled exhaust valves are retained, allowing the system to remain more subdued during lower-load driving while opening under high-load conditions for increased exhaust flow and a deeper, more aggressive V8 tone. The system is specifically engineered to reduce low-RPM drone, preserving the M550i's luxury character during cruising. Dinan's clamp-on tip design also allows the tips to be removed or replaced more easily than traditional welded-tip configurations.

Key Features & Specs:

• Brand: Dinan
• Series: Free Flow
• Product Type: Axle-Back Exhaust
• Part Number: D660-0075
• Fitment: BMW M550i xDrive
• Chassis: G30
• Material: T304 Stainless Steel
• Body Material: T304 Stainless Steel
• Pipe Material: T304 Stainless Steel
• System Finish: Brushed
• Tip Finish: Polished
• Exhaust Tip Quantity: 4
• Tip Diameter: 4 in
• Tip Style: Double-Walled, Clamp-On
• Tip Branding: Laser-Engraved Dinan Logo
• Maximum HP Gain: +8 HP at 6,600 RPM
• Maximum Torque Gain: +6 lb-ft at 6,600 RPM
• Exhaust Valves: Factory computer-controlled valves retained
• Valve Operation: Limits sound during lower-load driving and opens fully under high-load conditions
• Sound: Deeper, louder, sportier V8 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: 1.9 hours
• Length: 66 in
• Width: 30 in
• Height: 16 in
• Weight: 73 lb
• Grade Type: Performance
• Dinan Point Value: 3
• Emission Code: 5
• UPC: 813725024653
• Alternate Tip Finish: Black ceramic coated version available as Dinan D660-0075-BLK

Fitment:

• 2018-2023 BMW M550i xDrive - G30