Dinan Free Flow Axle-Back Exhaust - BMW M3 (E90) 2008-2011 - Black Tips

The Dinan Free Flow Axle-Back Exhaust replaces the factory rear muffler section with a single channel, straight through canister built entirely from 100% T304 stainless steel. It weighs 10 lbs less than the stock BMW assembly and adds 6 hp and 5 lb-ft at 6,800 rpm, while an internal Helmholtz chamber cancels the cruising drone typical of free flowing systems. The system exits through quad 3 in black ceramic coated, laser engraved tips and hangs from the factory brackets and hangers for a stock-like fit.

Specifications

Documents: Installation Instructions (PDF)  |  Whitepaper (PDF)

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