Description
Enhance the exhaust sound and character of your BMW M3 or M4 with the 3.5-inch Equal-Length Mid-Pipe and optional Valved Axle-Back Exhaust System. Designed for the BMW G80 M3, G82 M4 Coupe, and G83 M4 Convertible, this modular exhaust system is engineered to refine the S58 engine's exhaust note, improve exhaust flow, and provide flexible configuration options for street and performance applications.
The system features a single 3.5-inch equal-length mid-pipe designed to balance exhaust pulses and produce a smoother, higher-pitched, more refined exhaust tone. Its optimized flow characteristics are engineered to support improved throttle response and power delivery throughout the rev range. The mid-pipe can be installed with the factory rear exhaust section or paired with the optional Valvetronic Designs valved axle-back system for enhanced sound control and a more aggressive exhaust character.
Compatible with OEM downpipes or free-flow front pipes, this system offers flexibility for different exhaust configurations. It is designed to deliver an engaging exhaust note without triggering check-engine lights.
Equal-Length Mid-Pipe Design
The equal-length configuration helps balance exhaust pulses, producing a smoother, more consistent, higher-frequency exhaust tone. The single 3.5-inch mid-section is engineered to optimize exhaust flow while supporting improved engine response and performance throughout the rev range.
The modular design allows the mid-pipe to work with the OEM rear exhaust section or compatible aftermarket rear sections. Owners can also upgrade to the optional valved axle-back system independently, providing a flexible path for further exhaust customization.
Sound Characteristics and Exhaust Control
With the factory downpipes installed, the equal-length mid-pipe produces a crisper, more engaging exhaust note designed to minimize unwanted cabin drone.
The optional Valvetronic Designs valved axle-back adds a quad-chamber muffler and OEM-style exhaust valves. With the valves closed, the system is designed to provide a quieter, more refined sound suitable for daily driving. When the valves open, the exhaust develops a louder, more aggressive motorsport-inspired character at the touch of a button.
Sound characteristics vary depending on the downpipes and rear exhaust configuration. The system is designed to avoid triggering a check-engine light.
Construction and Material Options
The exhaust system is available in T304 stainless steel or lightweight Grade 5 titanium, allowing owners to select their preferred material and weight characteristics.
The system features precision TIG welds, fully mandrel-bent tubing, and an included cross brace designed to improve structural rigidity. Premium double-wall or single-wall exhaust tips are included.
The Grade 5 titanium configuration offers weight savings of up to 57.8 lb compared with the factory exhaust, while the stainless steel configuration offers weight savings of up to 24.7 lb compared with the factory exhaust.
Electronic Valve Integration
The optional valved axle-back system features electronic exhaust valve control with an included controller for rapid valve opening and closing. OEM integration is also available for drivers who prefer factory-style exhaust valve operation.
The valve system provides adjustable exhaust sound characteristics, allowing drivers to switch between a more restrained sound and a louder, more aggressive exhaust note.
Modular Installation and Reversibility
The mid-pipe and axle-back sections can be installed independently, allowing owners to retain the OEM rear exhaust section or upgrade to the optional valved axle-back.
When installing only the mid-pipe or only the axle-back, the OEM exhaust pipe must be cut at the second dimple to ensure proper fitment. The system is designed to be fully reversible, allowing the vehicle to be returned to its factory exhaust configuration.
V3 System Compatibility Notice
V1 and V2 exhaust components are not compatible with V3 systems. The V3 mid-pipe incorporates additional clearance at the downpipe connection and mid-section. Small visible gaps before the connections are fully tightened are normal and intentional in the V3 design.
What’s Included
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Single 3.5-inch equal-length mid-pipe assembly.
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Cross brace.
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Hardware and clamps.
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Optional valved axle-back assembly with electronic controller and exhaust tips.
The valved axle-back is optional and is not included unless selected.
Product Specifications
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Product Type: Equal-length mid-pipe with optional valved axle-back exhaust system.
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Vehicle Platform: BMW G80 M3, G82 M4 Coupe, and G83 M4 Convertible.
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Mid-Pipe Diameter: 3.5 inches.
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Axle-Back Tubing Diameter: 2.75 inches.
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Material Options: T304 stainless steel or Grade 5 titanium.
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Stainless Steel Finish: Brushed.
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Titanium Finish: Raw/brushed.
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Valve Type: Electronic exhaust valves.
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Valve Control: Remote controller included with the optional valved axle-back; OEM integration available.
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Stainless Steel Weight Savings: Up to 24.7 lb compared with the factory exhaust.
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Titanium Weight Savings: Up to 57.8 lb compared with the factory exhaust.
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Construction: Precision TIG-welded, fully mandrel-bent tubing.
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Additional Component: Cross brace for rigidity.
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Exhaust Tip Options: Premium double-wall or single-wall tips included.
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Downpipe Compatibility: OEM downpipes or free-flow front pipes.
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Installation: Mid-pipe and axle-back can be installed independently.
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Reversibility: Designed to allow restoration to the factory exhaust configuration.
Vehicle Fitment
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2020+ BMW G80 M3
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2020+ BMW G82 M4 Coupe
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2020+ BMW G83 M4 Convertible
