Mainstream Tuned Bolt on WRX

[ianb52]

Question, I have a 03 wrx which i picked up used. The previous owner installed a borla exhaust with pipes and he put a boost gauge on the column so since i got it i have noticed when floored it will boost to almost 20 psi and it bounces from 15-20. Is this the same result you had and if so can you lend any insight on what to do because i know its a matter of time till the stock turbo croaks at this rate. Also am i right in the assumption that the larger exhaust is whats causing the higher boost?

[turbomirage]

Why would your turbo croak? Just because it is boosting 15-20psi? Is the needle spiking to 20 psi, then dropping to 15 psi... Or fluctuating between the two when your at WOT? And no, putting a bigger exhaust on your car does not increase boost pressure. All it does is free up power throughout your powerband and helps your turbo breath... especially in the upper part of your powerband.