In some classes of truck pulling, Pro Stock 4×4, etc.. The class rules might have the need for downswept headers. These are easily built in house at GP Headers using your exact engine and chassis for a mockup. We are able to take a design and build from it to clear all of the components that you are running so you can pass the class rules. These are no joke, Pro Stock Big Block Chevrolet and C460 Ford engines that are able to handle 1000+ HP applications without a hiccup is a reality. We can help you determine the exact primary piping and design that will achieve your pro stock pulling goals. 100% Custom and Hand Built in the USA!