ABOUT THE PRODUCT
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.
When will my order ship?
If it’s in stock and the order is placed before 3pm, it ships the same day. If you ordered a product with ceramic coating, it will ship the following business day.
If the product or color spec you’re looking for is not in stock, you can join the waitlist by clicking the “email when available†button underneath the “out of stock†label. We will email you as soon as your product is available and give you an estimated back in stock time.
What if I submitted a custom order?
If you are making a custom order, email us to submit your request and we will give you an estimated delivery time based on the special manufacturing time.
What if my product arrives damaged, incorrect, or is missing parts?
If you received the incorrect product or color, missing parts, or the item is defective, email us a picture with your order number and you will receive a refund or exchange. Contact us at info@shopprojectgamma.comand we will work with you to make it right.
What if I’m not satisfied with the product?
If the product is unused and uninstalled, we can offer you a refund, exchange, or store credit. If the product was used or installed on your vehicle, we unfortunately cannot offer any refund, exchanges, or credit.
What if I installed my products and then I decide I don’t like them?
Unfortunately used or installed products will not qualify for a return or refund. If you have any questions or concerns you can email us at info@shopprojectgamma.com
A restocking fee of 20% of the original purchase price may be applied to returned products. This fee covers the costs associated with processing the return and restocking the item if applicable. Please refer to our policies page for more info regarding all exchanges and returns.
Have a question you don't see answered here? Email us at info@shopprojectgamma.com and we'll get back to you.