• Quad 4.5 in. Tips
• Mounting Hardware

The Dinan D660-0086-BLK Free Flow Axle-Back Exhaust transforms the sound profile of the BMW X3M and X4M, giving the “baby M’s” a voice on par with their V8 siblings. Featuring 76mm piping and quad 4.5 in. tips, the system delivers a deeper, more aggressive tone while maintaining interior civility. Computer-controlled valves adapt sound output by routing flow between outer and inner tips depending on load, while drone-abatement technology ensures a quiet cabin experience during regular driving.

Dinan D660-0086-BLK Free Flow Axle-Back Exhaust Features:

• More Power: +8 HP and +6 ft-lb of Torque
• Enjoyably Louder, Sportier Sound
• Quad 4.5 in. Diameter Clamp-On, Double-Walled, Black Ceramic Coated and Laser Engraved Exhaust Tips
• Tuck-It Tip Design Ensures a Nearly Flawless and Unencumbered Visual Appearance
• 100% 304 Brushed Stainless Steel Construction with TIG Welding
• Larger Diameter Piping for Increased Flow (76mm vs 70mm)
• 5 lbs Lighter Than the Stock System
• Computer Controlled Exhaust Valves Retained, Limiting Noise During Low Speed Driving and Opening Fully During High-Load Conditions
• Twin Exhaust Valves Are 76mm Diameter – 30% Less Restrictive Than OE Valves
• Easy Bolt-On Installation with Included Mounting Hardware

Emissions Note:

This part is legal for sale or uses on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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