nitrous wont give you a higher redline, it will make you hit that lower redline faster though. with the tpi youre torque peak comes on a lot faster than a four barrell setup on a mild motor, thats what they make, torque, not hp, im sure if you modded tb, ported all the plenums, airfoil, siamesed runners you would get maybe 6k, im not sure about that though. im going to tpi probably, and then upgrade to the holley stealthram later on once everything is wired up and running for a while.