Contrary to what the other two guys will tell you, the current popular belief is that the FS internals will hold out to 14-16 lbs of boost, so you're looking at pushing the limits there.

FWIW, I don't think you need more than ~10 lbs if it's tuned well. That'd put you in the neighborhood of 215 whp, which would certainly be fun, ~65 more than stock.

 

yeah, thats enough to beat the cocky stock mustangs around here (no offense to mustangs, its just the ones around me are stock)

 

how much psi does the stock mazdaspeed come with

 

6PSI

 

thats what i thought

 

r there any aftermarket headers for the mazdaspeed, that would add some nice boost for a good price.

 

headers? for an inline 4 with a turbo?

 

i know, thats why i asked

 

my bad it was 12-15psi not 20psi i plan on running 10-12psi when i modify my speed can't wait to see what that will do.ALL HAIL PSEUDOREALITYX.HOLLA.