Re: header question?
Unless you upgrade the intake and exhaust as well, you won't be taking full advantage of the headers performance gain. Even after I upgraded everything including porting the heads, my rear wheel HP gain was just over 20 from stock.
You'd actually see more of a performance gain by getting a tuner rather than just bolting on a set of headers.
2000 XLT 4WD 4.0L OHV, 5 spd, Alabama Cylinder heads, Delta Cams Valve Train and Pushrods, JBA Headers, KKM Cone Air Cleaner, BBK Throttle body, Dynomax Cat-Back exhaust, Summit Racing drilled front rotors w/ EBC pads, Cobra rear disk brake conversion w/ Hawk pads, 8.8" 4.10 Traction-Lok