Hi all just new here and new owner of 350z love the car its a 2003 import scorpion exhaust and induction kit .but got a question not sure if this is right place but here goes, car will rev to red line no prob but when you hit 120mph (not in uk of course) it bogs down a and wont go past about 4000rpm seems to misfire or something but will rev to red line in lower gears 1 2 3 4 no prob