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

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.

If your item is in stock and the order is placed before 3 PM, it will ship the same day. Products that include ceramic coating are shipped the following business day. If the product or color you’re looking for is out of stock, you can join the waitlist by clicking the “Email When Available” button. We’ll notify you as soon as it’s back and provide an estimated restock time.

Custom Orders
For custom requests, please email us directly. We’ll review your order and provide an estimated delivery time based on the required manufacturing process.

Damaged, Incorrect, or Missing Items
If your order arrives damaged, incorrect, or missing parts, simply email us a photo along with your order number. We’ll arrange a refund or exchange right away. Contact us at info@ttmengineering.se and we’ll make it right.

Returns & Satisfaction
Unused and uninstalled products are eligible for a refund, exchange, or store credit. Unfortunately, once a product has been used or installed, we cannot accept returns or offer refunds. If you decide you don’t like a product after installation, it will not qualify for return.

Restocking Fee
A restocking fee of 20% of the original purchase price may apply to returned products. This fee covers the costs of processing and restocking. Please refer to our Policies Page for full details on exchanges and returns.