Dinan D660-0099 Valved Cat-Back Exhaust System BMW X3/X4 M40i

The Dinan D660-0099 Valved Cat-Back Exhaust System delivers enhanced performance and an exhilarating exhaust note for the 2018-2025 BMW X3 M40i and X4 M40i. This premium exhaust system is engineered with 100% 304 stainless steel construction for durability and corrosion resistance, while providing measurable power gains of up to 6 horsepower and 5 lb-ft of torque.

Performance and Sound:

• Larger diameter piping (83mm vs. stock 80mm) for increased exhaust flow
• Factory resonator/collector removed for increased volume and sportier sound
• Enjoyably louder with a delightful octave drop that enhances the inline-6 character
• Factory valve functionality retained—switch between refined cruising and rowdy acceleration
• Drone abatement technologies reduce unwanted cabin resonance

Installation and Fitment:

• Direct bolt-on installation with no cutting or welding required
• Factory-like fitment with all mounting hardware included
• Valve componentry included for both pre-LCI and LCI model compatibility
• 7 pounds lighter than stock (53 lbs vs. 60 lbs factory weight)

Finishing Touches:

• Quad 3.75-inch (95mm) double-walled tips available in polished or black ceramic coated finish
• Clamp-on tip design for easy installation and adjustment
• Laser-engraved Dinan logo for distinctive brand identification

This exhaust system represents the perfect balance between performance enhancement and daily drivability, allowing you to enjoy an aggressive sport exhaust when desired while maintaining civility in comfort mode.