Dinan High Flow Middle Exhaust (X-Pipe) - BMW M3 / M4 (G80/G82/G83) 2021-2026

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

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• 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-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy