Man 20K is a STEAL for that vette, if I weren't in the process of buying a new daily driver right now I'd be all over that thing. That is a serious turbo kit!
I tuned a vette that the owner made/did his own th400 swap (was M6) and it's a stock bottom end with truck heads and EPP's "FI" cam (like a 232 240 on a 115LSA I believe) and running just 9psi on the waste gate springs the car ran 10.41 @ 138MPH this weekend on a poor 1.91 60'. He had brake issues and it wouldn't hold at all to be able to leave under boost, but man 138 is MOVING on a shakedowns on a stock bottom end. Since the local dyno I tune on isn't load bearing, it's totally tuned on the street like my own turbo car. I give the success to that kit. I *LOVE* that TTi X setup. Those BB twins will make boost revving at idle! Best of luck on the sale. If it weren't such a short-notice deal, I had been contemplating selling my own T/A and going C5 and TTi after tuning the setup. Every kit TTi manufactures makes excellent power.
If you ever make it down to Richmond give me a holla, we had the Mid Atlantic Vette challenge on Saturday, and will have the Nat'l Corvette Challenge this coming weekend. Best of luck with the car and mentoring, and the sh*tty traffic up there in NOVA
-Steve Williams