you'll be pretty fine stock...turbo magazine tested it and to quote:
"The Celica's 2ZZ powerplant was left internally stock and the head was untouched. A tubular manifold was fashioned to position the turbo.."
you can view the rest of the article by clicking on the link below . note: because turbo magazine doesnt keep their articles past a certain point on their website, i have to give you a link to another site which posted it. the link below will be dead..click it anyway. when the url shows up in your browser, delete the "T" between "new" and "celica" and then try again. nTc.org: turbo magazine: xs engineering turbo, celica