- Jul 11, 2010
- 1,135
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Hey guys. Quick question here. I am running a 3.60 pulley with a Vortech S-Trim on my 03 GT. Last year it was making about 8 psi boost. That was with PP intake manifold/upper plenum/75mm TB, stock heads, stock cams, stock exhaust manifolds, HF cats and cat-back. Now the only thing different is that I have ported stage 2 Patriot heads. Everything else is the same. Is it possible to lose a small amount of boost going from stock heads to ported stage 2s? My gut says yes for obvious reasons. I seem to be down from 8 to abut 5-6. What do you think?