All I know is that Blitz S/C only adds 30-35 hp. for $5000 + Install. SCREW that, unless your rich. Last I checked, 95% of $20,000-$25,000 celica owners aren't rich.
Pick up the recent Import Tuner with the GT300 Celica GTS on it/in it. It has the Blitz S/C and a shot of Juice. PROBABLY has forged/upgraded Cams, rods, pistons, and lowered compression. That's just my guess.
For you GT owners out there, I stumbled across a website about a year back about a few guys that put turbo kits together. That's right. They just mix and match parts. They were selling one for the GT for around $3500. Try search engines. It may take a while, but you can find it. Also, consider talking to your nearest "Tuner" shop. Many times they'll tell you what will/ will not work in a car.
Seriously, take it to the pros. You're gonna' have to eventually take it to them anyway to put it (Turbo, S/C, NOS) on. Hope this helped, somewhat. BTW, who the hell found this post from 5 or 6 months ago? hehee