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.
| 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 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
