Dinan Free Flow Axle-Back Exhaust - BMW F3x 328i / 428i 2012-2016 - Black Tips

Dinan's Free Flow axle-back replaces the factory rear silencer section with 100% 16-gauge 304 stainless steel, cutting back pressure to free up 4 HP and 3 lb-ft at 6600 RPM. Four laser engraved 70mm (2.75 in.) T304 stainless tips finish the system in a black ceramic coating. Drone abatement is engineered into the muffler so the cabin stays civilized at cruise while the tone sharpens under hard acceleration. The system hangs from the factory brackets and hangers, so installation is bolt-on with no cutting or welding.

Specifications

Documents: Installation Instructions (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