This mid-section kit pulls the hydro-formed factory center section and its resonator and replaces them with 3.25 in (83mm) T304 stainless steel tubing in place of the stock 80mm pipe. At the middle sits a mandrel-bent X crossover built by hand rather than stamped, which evens out flow to both banks of tips and cleans up the uneven pulses behind the factory system's coarser notes. Deleting the resonator lifts volume, and the balanced crossover keeps that extra note smooth and full. Mounting hardware is included and the pipe hangs on the factory locations, a bolt-on job Dinan quotes at 1.5 hours.
Specifications
| Type | High-flow mid-section X-pipe, replaces the factory center section and resonator |
| Material | T304 stainless steel, polished |
| Diameter | 3.25 in (83mm), replacing 80mm factory tubing |
| Construction | Mandrel-bent tubing with a hand-built X crossover |
| Hardware Included | Mounting hardware included |
| Installation Time | 1.5 hours |
| Warranty | 2 year unlimited mileage, or the remainder of the BMW new-vehicle limited warranty |
| Part Number | D660-0103 |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2024-2026 | BMW | X5 | M Competition |
| 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
