The Dinan Free Flow Axle-Back Exhaust is built entirely from TIG-welded, brushed T304 stainless steel and runs larger 76mm tubing versus the 70mm stock piping for freer flow. A dual-valve design adds a second 76mm computer-controlled valve so gas flows evenly regardless of valve position, with valves roughly 30% less restrictive than the OE units that open under load for an aggressive, near straight-pipe tone and close at low speed for a civil cabin. Quad 4in double-walled, black ceramic-coated, laser-engraved tips finish the system. Dinan rates gains of +6 HP and +5 lb-ft at 6600 RPM, and the system is about 4 lbs lighter than stock. Installation is bolt-on with the included mounting hardware.
Specifications
| Type | Free Flow axle-back exhaust (dual-valve) |
| Material | T304 stainless steel, TIG welded, brushed |
| Tips | Quad 4in double-walled, laser-engraved |
| Finish | Black ceramic-coated tips |
| Valves | Dual 76mm computer-controlled (30% less restrictive than OE) |
| Piping Diameter | 76mm (vs 70mm stock) |
| Power Gain | +6 HP & +5 lb-ft @ 6600 RPM |
| Part Number | D660-0085-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2026 | BMW | M340i | Base |
| 2020-2026 | BMW | M340i xDrive | Base |
| 2021-2026 | BMW | M440i | Base |
| 2022-2024 | BMW | M440i Gran Coupe | Base |
| 2021-2024 | BMW | M440i xDrive | Base |
| 2022-2024 | BMW | M440i xDrive Gran Coupe | Base |
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