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What are the issues they usually have? I looked at some reviews before buying but nothing horrible. People had said they didn't like a few things but still worked for them. Im putting on either way but if there's thing I need to fix before putting it on, I will

I'm new here and my dad referred me to this page. I recently bought a 11 GT 6 speed and I just bought a used hellion single turbo kit with precision 67mm turbo(that's where the username came from). I'm looking at making 650 rwhp atleast. Is that possible with a 67 and at what psi? Would I need...