Dinan Valved Axle-Back Exhaust - 2020-2024 BMW M340i/M440i

OVERVIEW

Give your M340i or M440i (B58) the voice it deserves. This valved axle-back exhaust replaces the factory rear section with larger 76mm mandrel-bent T304 stainless steel piping (up from 70mm stock) and adds a second exhaust valve for even flow to both sides regardless of valve position.

SPECS

• Quad 102mm double-walled, laser-engraved exhaust tips
• TIG welded, brushed T304 stainless steel construction, free of hydroforming
• Retains factory valve actuator; adds a second valve for symmetrical flow
• Computer-controlled valves limit noise at low speed, open fully under load
• Gains: +6 HP / +5 lb-ft

PARTS INCLUDED

• 1x valved axle-back exhaust (Polished or Black Ceramic Coated tips per variant)
• Installation hardware

TECH RESOURCES

• Installation Instructions (PDF)
• Easy bolt-on install with included hardware

PART NUMBER

• Polished — D660-0085
• Black Ceramic Coated — D660-0085-BLK

VEHICLE APPLICATIONS