Dont bother with a cold air kit or the exhaust, it help you'd be just blowin $$$. If you want to keep the engine then try and find a supercharger, if not then look for a I6 or swap in a chevy 350 or a hemi.
2003 White TJ Sport 4.0 5 speed D44 w/ Aussie Locker 3.73 tow pkg 3"BDS, 6" LA RC 2.2 Shocks 1.25bl 1.25mml 33x12.50r15
2001 customized Suzuki Intruder 1500 100hp Harley Killer
70 CJ5 Build