Call American Racing Headers for your needs, I owned a C6 LS3 with 2" primaries and 3" back from headers and through the exhaust. I got everything from American Racing Headers.I am thinking about getting a full exhaust and like the kooks z06 headers with 3inch xpipe will this fit on my 05 c6 i know i also need the z06 catback but can i use the 1 7/8 z06 headers or do i need to buy the ls2 1 7/8 headers?