your gonna get swamped with opinions on first mods. my personal firsts were irs brace and bushings for security then i went with the intake pulley exhaust and tune. i got the jlt intake and billet flow 2.76 pulley with a pro chamber off road h-pipe and flow master mufflers. mine put down 480/498 but that was in FL. different dynos are always going to put out different numbers tho.