Found It Cheaper? Use Our Atlus Price Guarantee!
Dinan Freeflow Axleback Exhaust with quad 95mm black ceramic coated tips and stainless steel muffler for BMW M40i models.
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package
Photo - out of package

Dinan Freeflow Axleback Exhaust System for 2018-2025 BMW X3/X4 M40i - Black Quad Tips

$1,843.95 $2,306.95
-20%
In stock

Note: Images are for illustrative purposes only. The actual product may vary in appearance or contents. Please read the full description and verify the item you're receiving.

This product will be available soon, but you can pre-order now to get on the list before others!

US Based Support - In Florida

30 Days Satisfaction Guarantee

Price Match

Easy Financing

Dinan Freeflow Axleback Exhaust System for 2018-2025 BMW X3/X4 M40i - Black Quad Tips
$1,843.95 $2,306.95
$1,843.95 $2,306.95

Fits 2018-2024 BMW X3 M40i and 2019-2025 BMW X4 M40i.

The Dinan Freeflow Axleback Exhaust System (D660-0099-BLK) provides a sophisticated acoustic upgrade for the G01/G02 M40i platform. Engineered to eliminate the restrictive factory central collector and resonator, this system utilizes a straight-through, high-flow design that transitions to an 83mm single pipe. The included Helmholtz-equipped muffler is precision-tuned to cancel out drone-inducing frequencies while producing Dinan’s signature low-frequency rumble under load.

Constructed entirely from 304 stainless steel, this system retains full factory exhaust valve functionality. This allows the driver to maintain refined volume levels during low-RPM cruising while unlocking an aggressive, straight-pipe sound profile at higher engine speeds. The bolt-on design requires no cutting or welding and provides a significant weight reduction over the OE components.

  • Direct bolt-on installation with no cutting or welding required
  • 100% 304 stainless steel construction for corrosion resistance
  • Quad 3.75-inch (95mm) double-walled, black ceramic coated tips with laser-engraved logos
  • Retains factory electronic exhaust valve functionality
  • 83mm piping diameter vs. 80mm factory diameter for improved flow
  • Weight savings of 7 lbs compared to the stock exhaust (53 lbs vs. 60 lbs)
  • Performance gains of up to +6 HP and +5 lb-ft of torque
  • Integrated Helmholtz technology for cabin drone abatement
  • Manufacturer Part Number: D660-0099-BLK
📘 Guides & Manuals
🔧 Fitment & Compatibility
Year Make Model Submodel
2018-2024 BMW X3 M40i
2019-2025 BMW X4 M40i

Authencity Guaranteed

We only sell authentic products from verified brand partners and retail partners globally.

  • Visa
  • Mastercard
  • PayPal
  • American Express
  • Discover
  • Apple Pay
  • Google Pay

Can’t Find the Part You Need?

Our catalog represents only a portion of the automotive products available through our supplier network. If you cannot find a specific part, brand, or application on our website, submit a request below, and our team will help source it for you.

Please include as much information as possible, such as your vehicle's year, make, model, trim, engine, desired brand, or part number, to help us quickly identify the correct product.

Email is invalid

Image alt