Automatic Engine Swap...

[Jack The GTR]

ok ok im extremely new to WRXs so go easy ok so say i havea WRX w/ an automatic transmission but in my search for a super sleeper i decide i want to swap out for the STi engine...but decide theres too much traffic in the area to have a stick and not be annoyed. would it be a direct bolt on?
would i need to beef up the transmission?
any other points to this swap and info are greatly appreciated....thank you

[LjasonL]

Actually I'm pretty sure it would bolt up as long as the final drive ratios matched.