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

The Dinan D660-0099-BLK Valved Cat-Back Exhaust System transforms your 2018-2025 BMW X3 M40i or X4 M40i with enhanced performance, refined acoustics, and premium construction. Engineered for enthusiasts who demand both power and versatility, this exhaust system delivers measurable gains while retaining full factory valve functionality for on-demand sound control.

Performance Upgrades:

• Maximum gains of +6 HP and +5 lb-ft of torque over stock
• Larger 83mm diameter piping versus factory 80mm for improved exhaust flow
• Factory resonator and collector removed for increased volume and reduced restriction
• 7 pounds lighter than stock (53 lbs vs. 60 lbs factory weight)

Sound Characteristics:

• Enjoyably louder, sportier exhaust note with a satisfying octave drop
• Drone abatement technology reduces unwanted cabin resonance
• Factory valve functionality fully retained for refined or aggressive sound profiles
• Switch between civilized daily driving and spirited weekend mode instantly

Construction and Design:

• 100% premium 304 stainless steel construction for durability and corrosion resistance
• Quad 3.75-inch (95mm) double-walled exhaust tips with black ceramic coating
• Laser-engraved Dinan logo on clamp-on tips for distinctive styling
• Factory-like fitment with direct bolt-on installation

Installation:

• Direct bolt-on design requires no cutting or welding
• Includes all necessary mounting hardware and valve componentry
• Compatible with both pre-LCI and LCI model variants

This Dinan cat-back exhaust system delivers the perfect balance of performance enhancement, weight reduction, and acoustic refinement. Whether you're cruising in comfort mode or unleashing the full potential of your BMW's turbocharged inline-six, this exhaust adapts to your driving style while providing the quality and fitment Dinan is renowned for.