ABOUT THE PRODUCT
BMW M3/M4 (G80 | G82 | G83) Stainless Steel Catback Exhaust System
Upgrade your S58-powered BMW M3 or M4 with a high-performance, valved catback exhaust engineered to enhance sound, flow, and driving experience. This exhaust system replaces the restrictive factory rear section with premium stainless steel construction, delivering a deeper, more aggressive tone while retaining full compatibility with your car’s factory valved exhaust controls.
✔ Premium Stainless Steel Construction
Built from durable 304 stainless steel for superior corrosion resistance, long life, and track-ready performance.
✔ Direct OEM-Style Fitment
Designed as a bolt-on replacement that installs using factory mounting points — no cutting or modifications required.
✔ Full Valved Operation
Retains and works seamlessly with your vehicle’s original exhaust valve system so you can enjoy both refined daily driving and an aggressive soundtrack when you want it.
✔ Enhanced Exhaust Sound
Releases more exhaust flow than stock, creating a richer, fuller, and more dynamic sound across the powerband.
✔ Performance-Oriented Design
Improved exhaust flow helps reduce back-pressure and enhances throttle response — especially noticeable when paired with tuning or performance midpipes.
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.