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BMW M3/M4 Valved Catback Exhaust 2021+ (S58 G8X) | WSTN Performance
NO IMPORT FEES
The price you see includes all taxes and import duties. You won't pay anything more when it arrives.
Description
Want your M3 or M4 to sound as good as it looks?
The WSTN Valved Exhaust System transforms your S58-powered M car, sharper throttle response, lighter weight, and instant control over your exhaust tone with the push of a button. Built from true stainless steel, this system delivers raw performance and refinement in one package made to handle everything from daily drives to full-throttle runs.
Why Upgrade?
✓ Switch between muffled and straight piped, refined and aggressive tone using the electronic valve control system (remote included)
✓ Built to premium-brand specifications
✓ Gain throttle response and deeper tone with 3.5" mandrel-bent piping and reduced backpressure
✓ Drop 11 kg from the factory system for improved handling and sound
✓ Dual-walled black chrome tips for a motorsport-inspired finish
✓ Constructed from stainless steel, resists corrosion, heat, and cracking
✓ Direct bolt-on fit, no cutting or welding required
✓ 1-Year No BS Warranty
Fitment & Compatibility
✓ BMW G80 M3 Sedan (2020 +)
✓ BMW G82 M4 Coupe (2020 +)
✓ BMW G83 M4 Convertible (2020 +)
✓ Designed for S58 twin-turbo engines
In the Box
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1 × WSTN Performance Valved Exhaust System
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1 × Remote Control Unit (for valve operation)
- 1 × Full Fitting Kit (Gaskets, Clamps, Bolts)
Installation
✓ Fitment: Direct OEM-style bolt-on, mounts cleanly to factory points
✓ Install Time: ~2 hours (professional installation recommended)
✓ Includes: Everything required for DIY setup
Why WSTN Performance?
✓ True Stainless Steel - Never mild steel or coated alternatives
✓ Engineered Fitment - Each system is model-specific and CNC-formed for precision
✓ Performance You Can Feel - Lighter, stronger, and tuned for balanced volume
Bring Your M Car to Life
Refined when you need it. Brutal when you want it.
Warranty / Shipping
DISCLAIMER
WSTN Performance components are designed for track and competition use. To protect your build and ensure a perfect finish, we recommend professional installation by a certified specialist/workshop. It is the buyer's responsibility to ensure modifications comply with local regulations.
WARRANTY
We stand behind every product we curate. All parts feature a minimum one-year manufacturer's warranty as standard. This covers any manufacturing defects, giving you total peace of mind that your upgrade is built to last. View our full Warranty policy page here.
SHIPPING
We offer tracked worldwide shipping on our entire catalogue. In-stock items dispatch within 2–4 days. All items arrive with full tracking. View our full Shipping policy page here.
RETURNS
We offer returns on all products if items are damaged or there is something wrong. If we ever make a mistake, we'll cover the return shipping to make it right. View our full Return policy page here.
SUPPORT
Need a hand with fitment, shipping, or a return? Our Perth-based team is here to help you get your build perfect.
Email: contact@wstnperformance.com
SOUND CLIP
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Support
FAQ
Every system we build is vehicle-specific. If you're unsure, reach out before ordering with your make, model, year, and any relevant modifications or click the "Fitment Check" box on this page - we'll confirm fitment before you spend a dollar.
It depends on what's been changed. upgraded turbo, upgraded mid pipe or prior exhaust modifications can all affect fitment. Our exhaust systems/downpipes are designed to fit vehicles stock, from factory. Contact us with your build details and we'll advise honestly.
We work with premium-grade T304 stainless steel and titanium alloy depending on the application. Material specs are listed on each product page
We're built to the same standard, the same materials, the same fabrication quality, the same attention to fitment and finish. The difference is we're not charging you for a badge. You're paying for the product.
Sound level varies by product, vehicle, and configuration. Where available, we've included sound references on the product page. If you want to know what a specific system sounds like on your car, reach out - we'll point you in the right direction.
A properly designed exhaust system reduces back pressure and improves flow - which typically translates to real performance gains. Our downpipes in particular are designed to let turbocharged engines breathe properly. Specific gains depend on your vehicle and tune.
Road legality varies by state, country, and vehicle. It's your responsibility to confirm compliance with your local regulations before fitting. We can advise on the product side, but we can't make that determination for you.
Items listed and in stock ship in 2-3 days. Hand built to order lead times vary by product and are listed on each product page. We'll send you an update at each stage so you're never left wondering where things are.
Yes - we ship worldwide via DHL, FedEx, UPS, and Australia Post depending on your location. Shipping options and estimated costs are shown at checkout.
Reach out before ordering and we'll tell you exactly where things stand and if we can put priority on your build. We'll always be upfront about timeframes.
We strongly recommend having your system fitted by a qualified workshop, particularly for vehicles where warranty or road compliance is a consideration. A professional install also protects the quality of the finished product and ensures proper fitment.
Yes - all necessary hardware is included unless stated otherwise. Some exhausts and downpipes use your cars existing hardware. If anything is missing from your order, contact us immediately and we'll sort it out.
In many cases, yes. Contact us with what you're after and we'll let you know what's possible and what it'll cost.
Contact us directly. We stand behind what we build. If something isn't right, we'll make it right - no runaround.
Yes. Warranty details are outlined in our warranty policy. If you have a specific question about coverage on a particular product, get in touch before you order.
Because every product is built to order, we can't accept returns for change of mind. That's why we strongly encourage you to confirm fitment with us before purchasing - we'd rather sort that out upfront than after the fact.
- Fitment guaranteeTell us your engine code and we confirm the fit before it ships.
- 12 month warrantyEvery system is covered for 12 months.
- Shipped worldwideTracked delivery wherever you are.
- Built to your engine codeMade to order for your exact car, not a universal part.