Precision-engineered valved mufflers with remote control. Open it up on the weekend. Keep it quiet on Monday morning.
Every kit pressure-tested before shipping. Universal fitment — everything you need in the box.
Direct-fit upgrades that transform the front end — no cutting, no drama.
Full stainless steel or titanium exhaust systems for the 2025-and-newer BMW M5 (G90). 3.15" diameter — just like OEM. Choose standard or valved mufflers.
Stainless downpipes and long-tube headers for the W204 C63 AMG (M156). Start with downpipes, add headers, or run both.
A look at how the parts we sell are built and finished — and the stock sitting on the shelf ready to ship.
Photos show a range of our supplier's exhaust products and facility, not exclusively the M5 systems.
The Jass Autoworks lineup is growing. Exterior and interior — same standard.
Aggressive front-end styling in durable ABS and carbon-look finishes.
Rear diffusers that finish the look and clean up airflow.
Shift knobs, trim, and details that elevate the cabin.
Every muffler is inspected and pressure-tested before it ships to your door.
Open or close the valve from your key fob. No wiring headaches — kits included.
Multiple inlet diameters to suit most builds. Fitment help before you buy.
Built by car people, for car people. Real support from someone who gets it.
Warranty on every valved muffler kit, covered from delivery day.
Orders processed within 2 business days, shipped across the US & Canada.
Fitment questions answered by an enthusiast, not a call center.
Inside each muffler is a valve you control from a key fob remote. Valve closed, exhaust flows through the muffler's chambers and stays near-stock quiet. Valve open, exhaust bypasses the baffling for a deep, aggressive tone. One button switches between them anytime.
The kit is universal-fit and works with a wide range of vehicles, but it's welded in place of your existing mufflers — so fitment depends on your exhaust setup. Email us your year, make, model, and current exhaust at contact.jassautoworks@gmail.com and we'll confirm before you order.
Significantly louder and deeper than stock — how loud depends on your engine, existing exhaust, and whether you run one or both valves open. Closed, most cars return to near-stock volume for daily driving.
Exhaust noise and modification laws vary by state and province, and it's your responsibility to know the rules where you drive. The valve system actually helps here — you can run quiet mode on the street and open it up where it's appropriate.
Any exhaust or fabrication shop can weld the mufflers in — typically an hour or two of labor. The remote system is plug-and-play: run the vacuum lines, connect the control box to 12V power, and pair the remotes. Installation video coming soon.
Every kit carries a 3-month warranty against manufacturing defects, and unused kits can be returned within 30 days. Email contact.jassautoworks@gmail.com and we'll sort it out.
Early access to new parts, restocks, and launch deals. No spam.
Questions about fitment or your order? Email us at contact.jassautoworks@gmail.com — we respond within 24 hours.
We ship to the United States and Canada. Orders are processed within 2 business days and shipping costs are calculated at checkout.
Unused items in original packaging can be returned within 30 days of delivery. Email us to start a return. Buyer covers return shipping.
Once we receive and inspect your return, refunds are issued to your original payment method within 5–10 business days. Concerns about an order? Contact us first — we'll make it right.