To answer your questions, if you want a sub 12 second SC, your pretty much talking about a full engine prep for turbo, 8:5 to 1 comp forged piston set up, connecting rods, wrist pins, buttons and all. You'll be surprised at how well the Toyota head flows already, but I know alot of people that still do the head work anyway seeing as how your going to need to swap out to forged valves anyway. I would do a Meth/02 system and single turbo set up. Once you get the drivetrain squared away, the biggest advantage I see here is with your Honda your pretty much at the top of the range of power your going to get without starting all over anyway. So if your going to start all over, an SC or GS, or IS, is going to give you alot more HP potential then the Honda's. Not to mention rear wheel drive instead of the Honda gotta catch ya to pass ya FWD technique. LOL!! There's an SC here in Florida blowin 7 second 1/4's. The only time I ever saw him lose was to an MK Supra that dropped a 6.36 1/4 :o !!! and a Grand National that runs about the same times. But that's only because another friend of mine that lives around the corner from me hasn't run his twin turbo charged Tundra 4.3 liter V8 Supra yet. (Shaking head in complete disgust with just how sick that set up is.) Man that car is a beast!