Dinan's Free Flow axle-back replaces the factory rear silencer section with 100% 16-gauge 304 stainless steel, cutting back pressure to free up 4 HP and 3 lb-ft at 6600 RPM. Four laser engraved 70mm (2.75 in.) T304 stainless tips finish the system in a black ceramic coating. Drone abatement is engineered into the muffler so the cabin stays civilized at cruise while the tone sharpens under hard acceleration. The system hangs from the factory brackets and hangers, so installation is bolt-on with no cutting or welding.
| Type | Free Flow axle-back exhaust system |
| Position | Rear, axle-back section |
| Material | 100% 16-gauge 304 stainless steel |
| Exhaust Tips | Four 70mm (2.75 in.) T304 stainless, laser engraved |
| Finish | Black ceramic coated tips |
| Power Gain | +4 HP and +3 lb-ft at 6600 RPM |
| Hardware Included | Mounts to the factory brackets and hangers |
| Warranty | Remainder of the vehicle manufacturer's new car limited warranty (up to 4 years/50,000 miles), or 2 years/unlimited miles from date of purchase, whichever is greater |
| Part Number | D660-0046-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2012-2016 | BMW | 328i | Base |
| 2013-2016 | BMW | 328i xDrive | Base |
| 2014-2016 | BMW | 428i | Base |
| 2014-2016 | BMW | 428i xDrive | Base |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
