Dinan's Free Flow axle-back exhaust for the F80 M3 and F82/F83 M4 is dyno tuned for maximum flow with minimum backpressure, adding roughly 5 horsepower. Twin 76mm secondary valves are 45% less restrictive than the OE valves and stay computer controlled, quiet at low speed and open fully under load, so tone can still be adjusted through the M-Drive settings. The full system is 100% 304 stainless steel and about 3 pounds lighter than stock, using the factory brackets and hangers for a precise fit. It exits through quad 3.5 inch laser engraved black ceramic coated tips.
| Type | Free Flow axle-back exhaust |
| Material | 100% 304 stainless steel |
| Tips | Quad 3.5" laser engraved |
| Tip Finish | Black ceramic coated |
| Valves | Twin 76mm secondary, 45% less restrictive than OE |
| Power Gain | +5 HP |
| Part Number | D660-0050-BLK |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2018 | BMW | M3 | Base |
| 2015-2020 | BMW | M4 | Base |
| 2019-2020 | BMW | M4 | CS |
| 2016 | BMW | M4 | GTS |
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.
