The Dinan High Flow Middle Exhaust replaces the hydroformed factory center section on the G8x M3 and M4, running from the secondary catalysts back to the axle-back and deleting both resonators for a louder, fuller note. It substitutes larger 3-inch (76mm) T304 stainless steel tubing for the stock 2.75-inch (70mm) pipe and adds a mandrel-bent X-pipe crossover that evens flow across both banks and removes the harshness caused by uneven exhaust flow in the stock system. The section weighs 5 pounds less than the factory mid-pipe and pairs with the Dinan valved axle-back for the complete system.
Specifications
| Type | High-flow middle exhaust (X-pipe, resonator delete) |
| Position | Mid-section (secondary catalysts to axle-back) |
| Material | 100% T304 stainless steel |
| Tubing Diameter | 3in (76mm), vs 2.75in (70mm) stock |
| Crossover | Mandrel-bent X-pipe |
| Weight Savings | 5 lb lighter (17 lb vs 22 lb stock) |
| Part Number | D660-0094 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2026 | BMW | M3 | Base |
| 2021-2026 | BMW | M3 | Competition |
| 2022-2026 | BMW | M3 | Competition xDrive |
| 2021-2026 | BMW | M4 | Base |
| 2021-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2023 | BMW | M4 | CSL |
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