Blue88GXL

I think im about to port and polish my intake and exhaust. I have instructions on how to do the intake ports, but i need info on the exhaust porting. Does anyone know what gaskets i will need to replace in this operation, and where i can get them? Any idea how much hp@the rear wheels i will be looking at with a good port and polish?

Also, I just got an Apexi safc. I know that everyones car is different, different tunings work better on different cars, location and conditions dependent and that sort of thing. But does anyone have something similar to what ive got (headers, open arospeed muffler, bonez intake) that could give me a good configuration to start with?