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^ REALLY?
I had the same kit with the 3mm InlineHG @ 14.5 psi i made 384 at the wheels WITH stock exhaust =)
I DEF would have been at 400 plus with a single inch
ummm are you sure it's not 317hp i had the same kit with the 3mm inlinepro gasket @ 14psi i made 336hp and 242tq that's why i sold it...
Wow. Did you try to solve this problem before selling it, seems like a lot of trouble to go through for a kit that is proven to work. I had one and made good power with it at 7 psi. Great numbers to the OP