if your wanting a 4.0L V6 to rev like a 2.2 4cyl its not gonna happen, but an e-fan, a fully set of pulleys from NST, a lightweight flywheel and clutch, intake, headers, exhaust will be a huge improvement. if you wanna get real crazy, forged pistons, lightened and knife edged crank and more aggressive cams with a 3 axis PnP. but your talking some serious bank. the other thing you have to look at is wether you wanna stay N/A or go Fi and how soon, if your N/A and you get rid of all the rotating mass, your not gonna have any low end torque for launching, if your Fi, the added power makes up for the lack of inertia in the drivetrain. hope that helps