How much horsepower can my 01' Celica transmission handle?

I'm highly considering doing an 3rd gen 3sgte engine swap into my 01' celica gt. I can get this engine from my buddy for $700 and i [img][/img] t has only 25,000 miles on it. I've done a handful of engine swaps in the past so I'm probably going to do this myself. I'm just wondering how much horsepower my transmission can handle. I know the celica gt stock engine only produces like 140 hp and the 3sgte turbo engine can produce well over 240 hp. Would I be able to use my transmission or should I upgrade?