Alright, looking into this further I will need to determine whether or not twins would fit. They'll obviously be small turbos, but it might not fit. That issue has got to be diagnosed and we will go from there. That's really the only thing the guy at the shop is worried about is fitment.
Other than that, I've got some quotes and it'll be a bit more expensive than first anticipated. Full custom stainless steel exhaust fitted up to a turbo or two will cost in the neighborhood of $1800. The header is the expensive part, but it is absolutely a work of art. He welds like 4 or 5 small pieces of pipe together for each tube and it's just gorgeous. Way expensive, but gorgeous.
Aside from that, I am about to get more serious in looking up wastegate and BOV specs I should look for. Once I figure out if I can fit two turbos, I will look further into that.
Meanwhile, I'm getting my car tuned out on Saturday morning (by the same guy who I've been talking to about the TTs. He'll probably help me figure out if they can fit the turbos or not). I should be running at least 240 WHP by Saturday afternoon. Stage 1 (just a basic tune and 42.5 injectors) runs 230 WHP (GM claim) and I'll have a much better tune, 60 lb injectors, LS4 throttle body, ported/polished supercharger, intake, exhaust, and cooler spark plugs. Put it to you this way, I raced my buddy's Stage 1 SRT4 (240 WHP / 260 tq) last Saturday completely untuned with intake/exhaust and slightly P/P SC and had my front end at his back bumper. Should be exciting! I'll be sure to update.