Guys,

I know this has been asked a lot, but I searched and I can't come up with an answer. Hope this will help.

I have a friend that is just begining to mod a 13B 6 port n/a 1989 rx-7. He also has a turbo 323 (astina is called, weird body style) runing about 250hp+ (w/o nitrous) non -us and now he wants to prove a point to the racers down here. He wants a fast mazda n/a. His choice was a rotary.

I am old school and know everything about 12as and carbs...but nothing in terms of EFI. My friend wants to retain the EFI system and make as much HP as possible with the RX7. He would like to keep the stock 6 port engine but I keep telling him to ditch it and get a 4 port turbo one.

The question is, what is the max possible Horsepower with a N/A EFI 6 port 13B? He is porting to whatever port is you guys recommend as long as he can keep the EFI.