Well it really depends on what generation 3SGTE you are speaking. Either way, it's not going to be a "hell of a lot." You're probably gaining 50-60hp (average of all 3sgte's) to the wheels in a car that will weigh around 3000. Which means you'll be a mid 14 second car. Woopy de doo.
It won't happen anyhow, I will say that it won't be done. If you do it then good for you, but I'm saying it's just day dreaming.