Im sorry but the "sale rep" seems like he doesn't know what hes doing..
I made 500 WHP with GTM stage 1 with just 8.8PSI stock engine/transmission, Now that being said, im sure you can achieve 600 WHP mark with stage one with higher boost...
If you are going for big turbos then might as well go for Single turbo because lag is going to be there in either kit anyways...
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