Dinan D660-0067 Free Flow Axle-Back Exhaust System for BMW M240i

The Dinan Free Flow Axle-Back Exhaust transforms your 2017-2021 BMW M240i with enhanced performance and an aggressive yet refined exhaust note. This precision-engineered system delivers measurable power gains while maintaining the sophisticated character BMW enthusiasts expect.

Performance Gains:

• Adds 6 horsepower at 6600 RPM
• Increases torque by 5 lb-ft at 6600 RPM
• Improved exhaust flow through optimized piping design

Sound Engineering:

• Sportier, more aggressive exhaust tone that enhances the driving experience
• Integrated Helmholtz resonance chamber eliminates unwanted drone during highway cruising
• Perfectly balanced volume—louder under throttle, civilized at cruise

Premium Construction:

• 100% 304 stainless steel construction for superior corrosion resistance and longevity
• Twin 89mm (3.5-inch) exhaust tips with laser-engraved Dinan branding
• Available in polished or ceramic black finish options
• TIG-welded joints throughout for maximum durability

Installation:

• Direct bolt-on replacement for the factory axle-back section
• Utilizes OEM mounting brackets and hangers for precise, factory-quality fitment
• No cutting or modification required

Engineered specifically for the B58-powered BMW M240i, this exhaust system maintains Dinan's reputation for quality and performance. The system provides an ideal upgrade for enthusiasts seeking improved sound and power without sacrificing daily drivability or long-term reliability.