BMW M440i Performance Exhaust - Dinan - Axleback, Quad Tips, T304 Stainless Steel, Black Ceramic Coated - Black - 2020-2026. A precision axle-back that brings a deeper, richer tone while preserving factory valve control and adding quad 4-inch tips.

Built from TIG-welded T304 stainless steel, the Dinan system ups pipe diameter to 76mm (vs 70mm stock) and integrates twin 76mm valves. The factory actuator is reused and a second actuator is added, so computer-controlled behavior remains intact—quiet when you want, assertive when you ask. With valves open, flow to the outer pipes provides a straight-through character; closed, gases route through the muffler to the inner tips for refined cruising. Drone-reduction strategies help keep the cabin composed. Dinan testing reports gains of up to +6 hp and +5 lb-ft at 6600 rpm, and the assembly trims about 4 lb vs stock.

Features

• 100% T304 stainless, TIG-welded axle-back
• 76mm piping for improved flow (vs 70mm stock)
• Twin 76mm valves; factory actuator reused plus added second
• Quad 4" black ceramic-coated, laser-engraved clamp-on tips
• Bolt-on install with included hardware
• Retains computer-controlled valves; reduced cabin drone

Questions or want this installed? Call our teams in Austin, Texas or the Los Angeles, California area. We offer professional installation and customization at both shops: 512-982-9393 (TX), 562-981-6800 (CA).

Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov