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 |
Shipping
- Orders placed before 3 PM ET typically ship the same business day. Larger items ship within 1 to 3 business days.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Special order items follow a lead time we confirm with you individually before the order is committed.
- Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
- Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
- Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
- Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
- Product images may be representative. The SKU and specifications in the listing are what ships.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Returns & Refunds · Warranty
