Szester - just a word of advice from being around these for a few years
25 psi is a wee much unless you've seriously reinforced the engine. 20psi is the most people will really run.
Also, if you want to make the most out of the car, cut the boost down to 18psi, get a GM MAS, a wideband O2 sensor ( like an AEM UEGO ) and a MAF-T
