This axle-back system swaps the factory rear section for free flowing 100 percent 304 stainless steel construction that lowers back pressure and returns 6 HP and 5 lb-ft at 6600 rpm. A Helmholtz chamber is designed into the system to cancel low rpm resonance, so the car stays civilized at cruise and only gets aggressive under hard acceleration. Twin 3.5 in laser engraved ceramic black tips finish it off, and the factory brackets and hangers are reused for factory like fitment.
Specifications
| Type | Free flow axle-back exhaust system |
| Material | 100% 304 stainless steel |
| Finish | Ceramic black tips |
| Tips | Twin 3.5 in, laser engraved |
| Power Gain | +6 HP and +5 lb-ft at 6600 rpm |
| Included | Reuses factory brackets and hangers |
| Quantity | 1 system |
| Part Number | D660-0045-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2012-2015 | BMW | 335i | Base |
| 2013-2015 | BMW | 335i xDrive | Base |
| 2014-2016 | BMW | 435i | Base |
| 2014-2016 | BMW | 435i 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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