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

The Dinan D660-0093-BLK Valved Axle-Back Exhaust System delivers an enhanced driving experience for 2021-2025 BMW M3 and M4 owners seeking performance gains and a more aggressive exhaust note. This premium exhaust system features 100% 304 stainless steel construction with larger diameter piping (76mm versus the stock 70mm) for improved exhaust flow and reduced backpressure.

Performance & Sound:

• Maximum gains of +6 horsepower and +5 lb-ft of torque over stock
• Sportier, more aggressive exhaust tone without excessive drone
• Computer-controlled exhaust valves retained for adjustable sound levels via M-drive settings
• Drone abatement technologies minimize unwanted cabin resonance

Design & Construction:

• Premium 304 stainless steel construction for durability and corrosion resistance
• Four 4.5-inch (114mm) double-walled black ceramic coated tips with laser-engraved Dinan logo
• Diffuser-filling tip design for aggressive rear-end aesthetics
• 6 pounds lighter than stock system (38 lbs vs. 44 lbs)

Installation & Compatibility:

• Factory-like fitment with all mounting hardware included
• Reuses stock exhaust valve actuators for seamless integration
• Direct bolt-on replacement for 2021-2025 BMW M3 and M4 models
• Exhaust valve operation remains unchanged for full M-drive functionality

The valved design allows for quiet operation during low-speed driving and city conditions, while opening fully under high-load acceleration to unleash the S58 engine's aggressive sound characteristics. This axle-back system provides the perfect balance of performance, sound, and daily drivability.