Our GX Series Cat-Back Exhaust has shattered all expectations! Designed to be AGRESSIVE but DRONE FREE sound that you will love. Manufactured using 304 stainless mandrel bent 3″ tubing and GX Series stainless muffler, these cat-back systems are designed for performance and sound without the raspy note at high rpms. Our GX Series will give your Expedition or Navigator the most turbo whistle possible!
Our GX Series mufflers use sound wave canceling technology without glass or metal fiber materials. Fiber/mesh materials will breaks down from harmonic vibrations, which is why the other brand’s exhaust systems will get louder each year. All SPD exhaust products are proudly built in the USA.
Installation is a breeze with our systems being 100% bolt on with no cutting needed.
We’ve got your back!
Function Factory Performance takes “customer service” very personally. We understand that finding the right parts can be overwhelming. Education and awareness are the principles that keep us ahead of the curve. Let us make this experience simple, easy, and excellent, so without hesitation, give us a call at (480) 576-8606. Feel free to direct message on our live chat or CLICK HERE to contact us via email.