BMW 440i Performance Exhaust - Dinan - Axle Back - Polished - 2016-2020. A precision-built free-flow axle-back that unlocks a richer, sportier tone while adding measured performance.

Engineered specifically for the 2016–2020 440i, Dinan’s system reduces back pressure for noticeable response and dyno-proven gains, yet remains composed during cruising. A tuned Helmholtz chamber mitigates low-RPM drone, while the stainless construction and carefully routed piping deliver durability and fitment using the factory hangers. Twin 89mm polished tips complete the look with clean motorsport character.

Features

• +6 hp and +5 lb-ft at 6600 RPM (axle-back, per Dinan testing)
• Helmholtz chamber design to curb cabin drone
• 100% 16-gauge 304 stainless steel for corrosion resistance
• Uses factory brackets and hangers; bolt-on axle-back
• Twin 89mm (3.5") laser-engraved polished tips
• Eliminates factory computer-controlled exhaust valve

Questions or ready to plan your build? Call our Austin shop at 512-982-9393 (TX) or our Los Angeles area team at 562-981-6800 (CA). We offer professional installation and customization at both locations in Austin, Texas and the greater Los Angeles, California area.

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

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