Dinan's Free Flow axle-back exhaust for the G30 M550i reduces back pressure for a gain of 8 horsepower and 6 lb-ft at 6600 RPM while retaining the factory computer controlled valves that stay quiet at low speed and open fully under load. Built from 100% 304 stainless steel, it bolts on with the included hardware and uses drone abatement tuning to keep the cabin calm at cruise before the V8 opens up under throttle. Four 4 inch double-walled clamp-on tips finish the system in laser engraved black ceramic.
Specifications
| Type | Free Flow axle-back exhaust |
| Material | 100% 304 stainless steel |
| Tips | Quad 4" double-walled clamp-on, laser engraved |
| Tip Finish | Black ceramic coated |
| Power Gain | +8 HP, +6 lb-ft @ 6600 RPM |
| Part Number | D660-0075-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2023 | BMW | M550i xDrive | Base |
Shipping
- Orders placed before 3 PM EST 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
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