40psi of boost. and NOT out of the stock turbo...stock HX35 can only handle 35psi before you are over-spooling it and just blowing hot air. also over 55psi i think is where you need the o-rings in the head as well.
haha well hot enough the pyro proab in the manifold melted:banghead:....needless to say im making MANY changes when i get the head back..hx50 ats manifold drivepresure gauge, studs, fire rings....the list goes on.
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