Vetteworks now manufactures exhaust collector pipe flange for the C5 1997 thru 2004 LS1 Corvette exhaust manifolds. This is a great way to connect a exhaust to factory Corvette C5 exhaust manifolds. Flange is laser machines and is 5/16" thick. Flanges are also available with an option 2.5" flared 3" long collector pipe and option GM C5 Corvette exhaust manifold seal.