I'm driving an '04 STX with the 4.6L, 4WD. I've added a cold-air intake from K&N, a Flowmaster Exhaust, and an Edge Programmer. My question is if I were to add a Throttle Body for BBK, and add a larger Mass-Air flow sensor, how much would it increase the performance, and durablitly of my ride. I've been told the Mass-Air flow sensor will do wonders, seeing how I have a CAI. But, is anyone have a new larger throttle body, or the set-up I'm talking about? I'd appreciate the help, Thanks!