With my mods and running 10 psi (I don't use the Zex by the way) how much power do you all est. I gained w/my streetport and yes it was professionaly done,
@crank? wheels??

 

I can't really judge it since I had bad seals prior to port job/rebuild, so power was plain low before

 

I think you gain about 15% depending on the size of the port...

 

isn't 15% N/A incr.? since there is forced induction isn't it less than that?

 

Well, its my understanding that porting gains, in terms of % increase, are more pronouced on an NA, since they still have those restrictive port sleeves...

...but, i'm not sure...

 

I don't remember exact mm increase but the ports were opened as much as they could be w/out screwing Idle up

 

i remember reading on an NZ site that they saw a power increase to over 200 hp on a 12A with an Extended Streetport (large streetport), without losing a smooth idle. i don't know how much power that would translate to a turbo'ed 13B, but there definately is potential there with a good high flow intake and exhaust.