WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The Dinan Free Flow Axle-Back Exhaust (D660-0085) is the definitive acoustic and flow solution for the 2020-2024 BMW M340i/M440i (G20/G22/G23/G26), implementing a signature quad-tip design that this potent B58 platform is worthy of. Constructed entirely of TIG welded and brushed T304 stainless steel, this system is engineered to provide an aggressive, meatier tone while maintaining interior civility.
The system incorporates larger 76mm tubing (vs stock 70mm) and an integrated second exhaust valve, promoting even flow regardless of valve position. This design allows freer flow through the entirety of the system and mimics an awe-inspiring straight pipe solution with a deeper and meatier tone when the valves are open. When the computer-controlled valves are closed, all gasses are forced into the muffler, retaining the intimate nature of the interior with zero drone. The system delivers a verified performance gain of +6 HP and +5 LB-FT of torque at 6600 RPM and is 4 lbs lighter than the stock system.
Features:
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Verifiable Power Gains: Delivers an increase of +6 HP and +5 LB-FT of torque at 6600 RPM.
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Quad Tip Aesthetic: Features quad 4" diameter clamp-on, double-walled, polished stainless and laser engraved exhaust tips (black ceramic coated also available) that perfectly fill the factory valance.
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Advanced Valve Control: Integrates a second exhaust valve and reuses stock actuators, ensuring symmetrical flow and allowing for aggressive tone when open and civil operation when closed.
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Optimized Flow: Features larger 76mm diameter piping (vs. stock 70mm) and twin 76mm exhaust valves that are 30% less restrictive than the OE valves.
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Structural Quality: Built from 100% 304 stainless steel construction and is 4 lbs lighter than stock.
Product Contains:
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(1) Dinan Axle-Back Muffler Assembly
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(4) Quad 4" Polished Stainless Exhaust Tips
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(1) Set of Mounting Hardware
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(1) Secondary Valve and Actuator (for second tip)
Warranty This product is supported by a Manufacturer's Warranty. Note: Manufacturer warranty terms are subject to change.
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