Dinan Valved Axle-Back Exhaust for 2021-2027 BMW M3/M4 - D660-0093-BLK

Bring a fuller, lower-pitched exhaust character to the G8x platform with the Dinan D660-0093-BLK Valved Axle-Back Exhaust. Engineered for 2021-2027 BMW M3 and M4 applications on the G80, G82, and G83 chassis, this dual-in/four-out system pairs TIG-welded T304 stainless steel construction with larger 76mm piping, retained factory exhaust valves, and four oversized 4.5-inch black ceramic coated tips. Dinan reports maximum gains of 6 HP and 5 lb-ft of torque while reducing axle-back weight by approximately 6 pounds compared with stock.

Extensive sound development went into balancing exterior volume with cabin comfort across both sedan and coupe/convertible body styles. With the valves closed, exhaust is directed through the Dinan muffler, where absorption and reactive technologies help create a deeper but more restrained tone. Under high-load conditions, the factory-controlled valves open and allow most exhaust gases to bypass the muffler for a near straight-through path and significantly greater sound. The stock valve actuators are reused, so exhaust behavior remains integrated with the factory M Drive controls.

Visually, the system is finished with four 114mm (4.5-inch) straight-cut, double-wall black ceramic coated tips that fill the factory diffuser openings. The polished T304 stainless system is brush finished, while the laser-engraved Dinan branding completes the performance-focused rear appearance.

Key Features & Specs:

• Brand: Dinan
• Product Type: Valved Axle-Back Exhaust
• Part Number: D660-0093-BLK
• Fitment: BMW M3 / M4
• Chassis: G80 / G82 / G83
• System Style: Rear Axle-Back
• Exhaust Configuration: Dual In / Four Out
• Exit Location: Rear
• Material: T304 / 304 Stainless Steel
• Body Material: T304 Stainless Steel
• Pipe Material: T304 Stainless Steel
• Construction: TIG-Welded
• System Finish: Brushed
• Intermediate Pipe Diameter: 3.0 in / 76mm
• Tailpipe Diameter: 3.0 in / 76mm
• Factory Pipe Diameter: 70mm
• Muffler Included: Yes
• Muffler Quantity: 1
• Muffler Configuration: Dual Inlet / Dual Outlet
• Muffler Material: 304 Stainless Steel
• Muffler Finish: Brushed
• Tip Finish: Black Ceramic Coated
• Exhaust Tip Quantity: 4
• Tip Diameter: 4.5 in / 114mm
• Tip Shape: Round
• Tip Cut: Straight
• Tip Edge Style: Beveled, Double-Wall
• Tip Material: 304 Stainless Steel
• Tip Branding: Laser-Engraved Dinan Logo
• Maximum HP Gain: +6 HP at 6,600 RPM
• Maximum Torque Gain: +5 lb-ft at 6,600 RPM
• Weight Reduction: 6 lb vs. stock axle-back
• Stock Axle-Back Weight: 44 lb
• Dinan Axle-Back Weight: 38 lb
• Exhaust Valves: Factory computer-controlled valves retained
• Factory Valve Actuators: Reused
• M Drive Compatibility: Factory exhaust valve operation remains unchanged
• Valves Closed: Flow routed through muffler for a deeper, more subdued tone
• Valves Open: Majority of flow bypasses muffler for near straight-through operation
• Sound: Deeper, louder, fuller exhaust character
• Drone Control: Engineered to reduce unwanted cabin resonance
• Catalytic Converters Included: No
• Installation: Factory-style bolt-on fitment
• Hardware Included: Yes
• Clamps Included: Yes
• Hangers Included: Yes
• Labor Time: 2.7 hours
• Grade Type: Performance
• Dinan Point Value: 3
• Emission Code: 5
• UPC: 090127141892

Fitment:

• 2021-2026 BMW M3 - G80
• 2021-2026 BMW M3 Competition - G80
• 2022-2026 BMW M3 Competition xDrive - G80
• 2021-2026 BMW M4 - G82 / G83
• 2021-2026 BMW M4 Competition - G82 / G83
• 2022-2026 BMW M4 Competition xDrive - G82 / G83
• 2023 BMW M4 CSL - G82
• 2027 BMW M3
• 2027 BMW M4