I used ctr cams and made 550 whp out a gsr , but I hear ctr, itr, or gsr are good up to 750 whp but it's your choice crower are good we used them before. bUt the ctr or itr were cheapier and made 550whp pretty easy but just telling you my opinion.
you made 550 on ctr cams WOW... i heard that they sucked for forced induction from my friends who dyno cars all day long... but gsr cams a good. but he is only running a B18b so crower.. you might want to look into CRANE cams they make so sick stuff
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