1967 - 87 ChevyGMC Truck. Small BlockBig Block. CNC mandrel bent for optimal flow 304 2 - 12 stainless steel for maximum corrosion resistance. Designed to fit Stainless Works and most aftermarket headers. Dual chambered mufflers that lets the truck have an aggressive sound and great thing about this is that the tailpipes exit in stock location behind rear tires. These, kits come with a lifetime warranty and proudly made in the USA