Expert Automotive Solutions for Your Vehicle
Quality LS harnesses, ECU programming, and custom builds.
About Fosth Performance
Our Story
Fosth Performance is a small family-owned business located in Monroe, WA. With a passion for automotive innovation, we specialize in full restorations, LS swaps, LS harnesses, motor builds from mild to wil Small family business in Monroe Wa. Specialize in LS harnesses, ecu programming, motor builds, motor swaps, full builds and much more. Builds and swaps arent the only thing we offer! Just next door is our store front J2 Racing which has everypart you need d and much more. Let us bring your dream project to life.