Sleek, I have a nice set of polished aluminum nicson exhaust manifolds, and a VERY NICE set of polished harden exhaust manifolds and one set of aluminum risers with the ability to be either a 2 7/8" outlet or a much larger outlet if you cut them back. Both sets of manifolds are straight and fit a 455 olds. Have you priced a new set of manifolds lately?, you better e-mail me first.