I wouldn't get CT to install the header myself. To much tweaking to do, that would cost you major labour hours.

Questions to the other guys that have done this:
1-Was the flange of the pipe connecting to the cat larger then cat flange? Mine looked like if it was design for a hi-flow cat.
2-Did the high heat black paint turn almost gray?
3-How long before all the smells of burning paint and everything else take to go away?

I would say that this system is a little louder then the old cast iron one but so far I'm ok with. Can't wait to see how it will survive it first winter?!?...