C6ZO6 Corvette Headers with 31" long primaries with "D" shaped port matched flange and 3" slip fit collectors. Includes 3" X-pipe, metallic substrate high flow converters, O2 extensions, Accuseal clamps, clamp/hanger assemblies, oil cooler lines, compression fittings, zip ties, cable clamps, etc. The most powerful LS7 headers available! For cars running head and cam packages, superchargers or NOS. Will require dropping of front cradle and rerouting the oil cooler lines, but the increase in power will be worth the effort.