GP Headers, Inc. offers the unique service of building custom headers to fit your application without having your car at our location. You can have a set of custom headers built to your exact header specifications using their PVC mock-up kit without your car ever leaving the garage. Imagine having a set of high end custom headers built with true merge collectors to fit for your unique application. All of their custom headers incorporate true merge collectors, heavy 3/8" flanges and are purge tig welded producing the finest custom header money can buy and built to your exact specifications. After hundreds of systems and years of experience, they have this system down to a science.