The Dinan Free Flow Axle-Back Exhaust replaces the factory rear muffler section with a single channel, straight through canister built entirely from 100% T304 stainless steel. It weighs 10 lbs less than the stock BMW assembly and adds 6 hp and 5 lb-ft at 6,800 rpm, while an internal Helmholtz chamber cancels the cruising drone typical of free flowing systems. The system exits through quad 3 in black ceramic coated, laser engraved tips and hangs from the factory brackets and hangers for a stock-like fit.
Specifications
| Type | Axle-back exhaust system, single channel straight through with Helmholtz chamber (Dinan Free Flow) |
| Material | 100% T304 stainless steel |
| Finish | Black ceramic coated, laser engraved tips |
| Size | Quad 3 in tips |
| Output | +6 hp and +5 lb-ft at 6,800 rpm |
| Part Number | D660-0028 |
Documents: Installation Instructions (PDF) | Whitepaper (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2011 | BMW | M3 | Base |
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
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