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Dinan Free Flow Polished Tip Axle-Back Exhaust - BMW M3 (F80) / M4 (F82/F83) 2015-2020

Dinan SKU: DNND660-0050
Price
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The Dinan Free Flow axle-back exhaust is built from 100% 304 stainless steel and exits through quad 3.5 inch polished, laser engraved tips. Twin 76mm secondary exhaust valves are 45% less restrictive than the OE valves, and the stock valve actuators are reused so exhaust tone still follows the M Drive settings. The valves stay closed to limit noise and drone at low speed and open fully under high load for maximum flow. The system is 3 lbs lighter than stock, adds a claimed 5 hp, and mounts on the factory brackets and hangers.

Specifications

Type Valved axle-back exhaust system (Dinan Free Flow)
Material 304 stainless steel
Tips Quad 3.5 in, laser engraved
Finish Polished stainless tips
Valves Twin 76mm secondary valves, reuses stock actuators
Weight 3 lbs lighter than stock
Power +5 hp (Dinan claim)
Part Number D660-0050
Warranty Dinan warranty matching the factory new car bumper to bumper warranty

Documents: Installation Instructions (PDF)

This part fits:

Year Make Model Submodel
2015-2018 BMW M3 Base
2015-2020 BMW M4 Base
2019-2020 BMW M4 CS
2016 BMW M4 GTS

Shipping

  • Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • 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 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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