I have a question for anyone that can help, I was thinking about buying a bigger throttle body for my truck,does anyone know about how much they run, and how hard they are to install? Also thinking about getting under drive pulleys will they help quite a bit? and how hard will they be to install. And if you could tell me which one I should invest in first or which makes the most amount of difference I heard that the throttle body does is that true. Hey thanks for everyones help.

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97 f150 4x4 stepside,4.2 V6, K&N,computer chip,keyless entry,remote starter,white gauge faces, straight pipe cat back,with one glass pack, 2 4"stainless tips.,tinted windows