ok, so heres the deal, I'm set @ 15psi, but at about 4500-5K boost starts to drop off, it drops as low as 10psi

and i'm sick and tried of it! i'm short on cash (dont have a job) and was wondering if there was a way to fix it for fairly cheap... I did some searches, and i know this is a common problem on the T25, and all internal wastegated turbos for that matter... any input? thanks guys!