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Ordered a set of Kook's w/ 6115CC (catted X-pipe) to mate to Corsa Sports (#14167) for my A6. The exhaust is fairly simple to install. Not 100% sure about the headers. I know they install from the bottom, but do you have to remove the plugs,wires etc? Havn't noticed any threads on installation. Have a local garage that is pretty good at exhaust, but I'm debating on wether to let him attempt the headers. He said he has done many ober the years, but not on newer Vettes. I worry about all the chatter on the site regarding replacing the O2 sensors in the same location, etc. If I use the local guy, he doesn't mind if I watch / help. I also found another performance shop and of course it's drop it off and come back in 8 hours. Checked these guys out and they seem to be more then capable. I guess I just am use to watching people work on my vehicles!