BMW M3/M4 (G80 | G82 | G83) Axle Back Stainless Steel Exhaust System

Upgrade the sound, performance, and rear-end appearance of your BMW G80 M3 or G82/G83 M4 with the Project Gamma Axle Back Stainless Steel Exhaust System. Designed specifically for the S58-powered G8X platform, this axle-back system delivers a deeper, more aggressive exhaust tone while maintaining factory-style comfort and drivability.

The Project Gamma axle-back exhaust features a valved performance muffler design that works with the factory valve system, allowing you to keep full control over your exhaust sound. With the valves closed, the system provides a cleaner and more refined tone for daily driving. When the valves open, the exhaust becomes louder, sportier, and more aggressive, giving your M3 or M4 the sound it deserves.

Constructed from high-quality stainless steel, this system improves exhaust flow by reducing factory restriction while providing excellent durability and corrosion resistance. The quad-tip design also enhances the rear appearance of the vehicle, giving it a more aggressive and performance-focused look.

Key Features

• Designed for BMW G80 M3 and G82/G83 M4
• Fits S58 3.0L twin-turbo engine vehicles
• Axle-back stainless steel exhaust system
• Valved design retains factory valve operation
• Deeper and more aggressive exhaust tone
• Quiet and refined when valves are closed
• Louder and sportier sound when valves are open
• Improved exhaust flow compared to the factory muffler
• Durable stainless steel construction
• Quad-tip rear design for an aggressive appearance
• Great upgrade for stock, tuned, Stage 1, Stage 2, and custom builds

Sound & Performance

The factory exhaust system on the G80 M3 and G82/G83 M4 can feel restricted, especially for owners looking for more sound and character from the S58 engine. The Project Gamma axle-back system helps reduce exhaust restriction through a performance muffler design, improving exhaust flow and creating a sharper, more exciting driving experience.

The valved setup gives you the best of both worlds: a comfortable tone for normal driving and a more aggressive sound when you want to enjoy the car.

Fitment

• 2021+ BMW G80 M3
• 2021+ BMW G80 M3 Competition
• 2021+ BMW G80 M3 Competition xDrive
• 2021+ BMW G82 M4
• 2021+ BMW G82 M4 Competition
• 2021+ BMW G82 M4 Competition xDrive
• 2021+ BMW G83 M4 Convertible
• 2021+ BMW G83 M4 Competition Convertible
• 2021+ BMW G83 M4 Competition xDrive Convertible

Engine: S58 3.0L Twin-Turbo Inline-6

Installation Note

Professional installation is recommended for proper fitment, alignment, and valve operation. Depending on the setup and connection to factory or aftermarket midpipes, minor adjustments or cutting may be required.