MPI Exhaust Technologies is the First Exhaust Company to Perfect Dual Exhaust systems for Gas Powered Pick-Ups. Our Systems Provide The Full Performance Advantage of a Dual Exhaust system while eliminating all unwanted Cab Noise and Guaranteed no Droning. These are High Quality Patented Pulse Chambered Weld together Kits Made from 14GA Aluminized Strongest Anti-Rust American Made Steel.