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.
Specifications
| 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 |
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