The Dinan Valved Axle-Back Exhaust runs larger 83mm tubing versus the 80mm stock piping into a Dinan muffler that uses both absorptive and reactive technologies to cut backpressure while abating low-RPM drone. The factory exhaust valves and their actuators are retained, so tone still adjusts through the M-drive settings, staying civil at low speed and opening fully under load. Twin secondary 76mm valves are roughly 30% less restrictive than the OE units. Four 4.5in (114mm) double-walled, black ceramic-coated, laser-engraved tips fill the diffuser. Built from 100% T304 stainless steel, the system adds up to +6 HP and +5 lb-ft and installs bolt-on with the included hardware.
Specifications
| Type | Valved axle-back exhaust |
| Material | T304 stainless steel |
| Tips | Quad 4.5in (114mm) double-walled, laser-engraved |
| Finish | Black ceramic-coated tips |
| Valves | Retained factory valves plus twin 76mm secondary valves (30% less restrictive than OE) |
| Piping Diameter | 83mm (vs 80mm stock) |
| Power Gain | +6 HP & +5 lb-ft |
| Part Number | D660-0090-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2023 | BMW | X5 | M |
| 2020,2024-2026 | BMW | X5 | M Competition |
| 2020-2023 | BMW | X6 | M |
| 2020-2021,2024-2026 | BMW | X6 | M Competition |
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