Dinan Freeflow Axleback Exhaust System with Quad 4in Black Tips for 2020-2026 BMW M340i & M440i (D660-0085-BLK)

Fits 2020-2026 BMW M340i and M440i models (including xDrive and Gran Coupe). This Dinan Freeflow Axleback Exhaust System (D660-0085-BLK) transforms the G20/G22/G26 exhaust note, replacing the restrictive single-valve factory setup with a high-flow, dual-valve configuration for superior symmetry and sound profile.

Constructed entirely from TIG-welded and brushed T304 stainless steel, this system increases piping diameter to 76mm (up from the 70mm factory bore). The innovative dual 76mm computer-controlled valves allow for maximum flow during high-load conditions while maintaining a civilized, drone-free cabin during low-speed cruising. The system is finished with quad 4-inch double-walled, ceramic black tips that are laser-engraved with the Dinan logo for a high-end, aggressive aesthetic.

• Direct bolt-on installation with all necessary mounting hardware included
• Retains factory exhaust valve computer control; adds a second valve for symmetrical flow
• Power Gains: +6 HP and +5 LB-FT torque @ 6600 RPM
• Weight Reduction: 4 lbs lighter than the OEM exhaust system
• Construction: 100% T304 stainless steel for corrosion resistance
• Tips: Quad 4-inch clamp-on, double-walled, ceramic black finish
• Piping Diameter: 76mm (3.0in) main tubing
• Part Number: D660-0085-BLK