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I highly doubt hes at 310 rwhp w/ no juice. I would be surprised if he was even at 300. With the juice yea you are probably close to 400 but I dont know much about nitrous #'s so maybe you are maybe you arent thats just my guess.
I'm putting about 430 to the wheels w/ my 98 Cobra. It took a LOT of work to get it to that point. No nos but 14psi on the supercharger, racing short block, 42# injectors etc..