Dinan Free Flow Axle-Back Exhaust - BMW X3 M / X4 M (F97/F98) 2020-2025 - Black Tips

The Dinan Free Flow Axle-Back Exhaust is built from TIG-welded, 100% brushed T304 stainless steel with larger 76mm tubing versus the 70mm stock piping for freer flow, and twin 76mm computer-controlled valves that are about 30% less restrictive than the OE units, opening under load and quieting low-speed driving. It exits through quad 4.5in (114mm) double-walled, black ceramic-coated, laser-engraved tips that use an inverted clamp-neck design to hide the clamp and keep a clean, straight-cut face. Dinan rates gains of +8 HP and +6 lb-ft at 6600 RPM, and the system is about 5 lbs lighter than stock. Installation is bolt-on with the included mounting hardware.

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