Putting together a s4 full Bridgeport with s5 n/a rotors. The porting was done using both pineapple racing templates. Am really want to run Borg Warner s475 but dint know what a/r to go with 1.10 or 1.32. The car will mostley be a track car with a few weekend cruises.

 

Well that depends on how much boost you plan on running, I'd probably say if you are gonna run less than 26psi then go with the 1.10 but if you plan on running more than that like over 30psi, get the 1.32

 

yea I wont be planning to go no higher than 25 psi.