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Dinan Valved Cat-Back Exhaust - BMW X3 M40i / X4 M40i (G01/G02) 2018-2025 - Black Tips

Dinan SKU: DNND660-0099-BLK
Price
11% OFF
In Stock – Ready to Ship
Shipping calculated at checkout.

The Dinan Valved Cat-Back Exhaust for the G01 X3 M40i and G02 X4 M40i replaces the factory single-to-dual layout with an enlarged, straight, single-pipe design in 100% T304 stainless steel. Eliminating the central collector and resonator raises volume, while a Helmholtz-equipped muffler limits drone frequencies for the signature low Dinan rumble. Retained factory valve control lets the exhaust shift from refined cruising to rowdy at full throttle, and it accepts an optional valve remote for on-demand sound. The bolt-on system needs no cutting or welding, ships with valve componentry for both pre-LCI and LCI cars, saves 7 pounds over stock, and adds up to +6 HP and +5 lb-ft. Quad 3.75-inch (95mm) double-walled tips are laser engraved with the Dinan logo.

Specifications

Type Valved cat-back exhaust
Position Cat-back (full system aft of catalysts)
Material 100% T304 stainless steel
Tubing Diameter 83mm (vs 80mm stock)
Muffler Helmholtz-equipped, drone abatement
Tips Quad 3.75in (95mm) double-walled clamp-on, laser-engraved Dinan logo
Tip Finish Black ceramic coated
Fitment Note Includes pre-LCI and LCI valve componentry
Power Gain +6 HP / +5 lb-ft (max)
Weight Savings 7 lb lighter (53 lb vs 60 lb stock)
Part Number D660-0099-BLK

Documents: Installation Instructions (PDF)

This part fits:

Year Make Model Submodel
2018-2024 BMW X3 M40i
2019-2025 BMW X4 M40i

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
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