The stock 370z I mean stock down to the air filter beat my Z but all I had was a shitty exhaust on it.. BUT he only had me half a car from a dig and I spun like hell. We slowed down about 135 or so. I went and bought dps, tps, JWT pop charger and a JWT chip with boost jets set on 12lbs. Let him find me now... Sorry just my .02 cents. But either way just do what feels right and makes you happy bc only you can feel your pain and happiness.