The Dinan Valved Axle-Back Exhaust upgrades the rear exhaust section of the G8x M3 and M4 with 76mm 100% T304 stainless steel tubing, enlarged from the stock 70mm to cut backpressure and free up flow. It retains the factory computer-controlled exhaust valves, so closed valves route gas through the Dinan muffler and out the inner tips for subdued low-speed cruising, while open valves bypass the muffler under load for a near straight-pipe roar. Drone abatement technologies inside the muffler keep cabin resonance in check, and the complete system runs 6 pounds lighter than stock. Peak gains reach +6 HP and +5 lb-ft, finished with four double-walled 4.5-inch clamp-on tips laser engraved with the Dinan logo.
| Type | Valved axle-back exhaust |
| Position | Rear (axle-back section) |
| Material | 100% T304 stainless steel |
| Tubing Diameter | 76mm (vs 70mm stock) |
| Tips | Quad 4.5in (114mm) double-walled clamp-on, laser-engraved Dinan logo |
| Tip Finish | Black ceramic coated |
| Power Gain | +6 HP / +5 lb-ft (max) |
| Weight Savings | 6 lb lighter (38 lb vs 44 lb stock) |
| Part Number | D660-0093-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2026 | BMW | M3 | Base |
| 2021-2026 | BMW | M3 | Competition |
| 2022-2026 | BMW | M3 | Competition xDrive |
| 2021-2026 | BMW | M4 | Base |
| 2021-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2023 | BMW | M4 | CSL |
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.
