Yes I know that there are some things that u can do to a celica st hatch but does anyone or some people want to list mods that i can do to my car cause really what im looking for is an engine swap but i wanna know what is the most powerful front wheel drive engine and transmission or anything else high performance that i can do to my car.

first check these out

http://www.6gc.net/forums/index.php?showtopic=29705

http://www.6gc.net/forums/index.php?showtopic=27939

Easy way would be a 20v 4AGE, most power would be a V6 or a 3SGTE. The V6 or the 3SGTE would both have to be custom fabricated more so than a GT because neither will drop in with small mods like the 4AGE.