what ive learned from 35+ years of wrenching my own performance mods & having them done for me,on various vec.s, is that you really cant just slap on, lets say a set of headers & expect a 10+ hp increase, like alot of companies claim, its when you do a combination of things ,,, headers , better throttlebody, catback , intake,chips, etc. that you may see that 10+ hp increase, & lots of people think its just not worth all that $ shelled out for that little a return. unfortunetly, its like the other poster said, the only way to get a significent hp/torque increase is to super/turbocharge, & or go inside the vec. engine itself. but i do say, that if you have the $, & want to get the things you stated, do it, you may think it is worth it, its a form of individual personalization. i myself am so use to doing it, that its just the first thing done on almost everything ive owned, force of habit, sometimes its been worth it, other times not. i certainly wouldnt mind having all that money back now during these economic times. thats my 2, goodluck
