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With his mods, he's putting down about 310 RWHP; 320 at best.
Id have to say you, he has longtubes and cams. Has to be making more than 310-320. seeing as how I make 311/327 with shorties off road x and intake, this was on a dnyojet, now if he was to throw his car on a mustang dyno then I'd agree with you. I know no two motors and tuners are the same but still id say he is making over 320