A buddy of mine has a 2001 zo6, but a built LS2 with a vortech supercharger making over 800hp to the rear wheels and uses a set of 1 7/8 from these guys http://www.americanracingheaders.com/homepage.htm
Even more so when your a passenger and its breaking the tires loose at over 100mph You can check out the rest of his combo on the vortech web site under v-rides (drew black z06 2001).