Dinan 3-Inch T304 Stainless Steel High Flow Middle Exhaust for 2021-2026 BMW M3 & M4

Fits select 2021-2026 BMW M3 and M4 models (Base, Competition, Competition xDrive, and CSL).

The Dinan High Flow Middle Exhaust replaces the restrictive, hydro-formed factory center section from the secondary catalysts back to the axle-back system. By deleting both factory resonators and upgrading to larger 76mm (3-inch) mandrel-bent T304 stainless steel tubing, this system significantly reduces backpressure and improves exhaust scavenging for a more aggressive performance profile.

At the heart of the system is a precision-crafted X-pipe. Unlike common stamped X-pipes, Dinan utilizes mandrel-bent tubing to ensure a smooth transition and minimum restriction. This design promotes even flow between both cylinder banks, eliminating unwanted acoustic nuances found in the stock configuration while delivering a louder, smoother, and fuller exhaust note. At 17 pounds, this system provides a 5-pound weight reduction over the factory mid-section.

• Constructed from 100% T304 stainless steel for superior corrosion resistance
• 76mm (3-inch) tubing replaces the factory 70mm (2.75-inch) section for increased flow
• Mandrel-bent X-pipe crossover optimizes sound and minimizes restriction
• Deletes factory resonators between secondary catalysts and the rear muffler
• Lightweight design: 17 lbs vs. the 22 lb factory unit
• Factory-like fitment with all necessary mounting hardware included
• Manufacturer Part Number: D660-0094