The Dinan D660-0094 High Flow Middle Exhaust replaces the factory resonated center section on the G80 M3 and G82/G83 M4 with a freer-flowing 3 in. mandrel-bent stainless steel system. Designed to deliver smoother, louder, and more sophisticated acoustics without replacing the rear muffler, it offers a cost-effective performance upgrade that’s easily paired with Dinan’s axle-back system for even more aggressive tone. The custom-fabricated X-pipe balances exhaust flow across both banks to eliminate uneven resonance, while the removal of the OEM resonators increases overall volume and reduces weight by 5 lb. compared to stock. Built from TIG-welded 304 stainless steel and engineered for perfect fitment, this middle exhaust system offers improved sound and flow without affecting emissions compliance.

Dinan D660-0094 High Flow Middle Exhaust Features:

• Produces a smoother, louder, sportier exhaust note
• Replaces stock 2.75 in. tubing with 3 in. mandrel-bent stainless steel
• Deletes dual resonators between secondary catalysts and rear muffler
• Includes free-flowing X-pipe crossover
• Weight savings of 5 lb. vs. stock system (17 lb. vs. 22 lb.)
• Constructed from 100% 304 stainless steel
• Factory-style fitment with mounting hardware included

Emissions Note:

This part is legal for sale or uses on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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