ok I have a question for you guys wit the tuners. from what I have read on here they seem to work better on trucks that arent heavily moded. that being said I haave a 99 5.9 with about 92k only things I have done to it are a round air cleaner and exhaust dump after the cat, I have been thinking about a fastman 52mm as well. Now I have been thinking about gettin a tuner off ebay or something along those lines they seem to be cheap on there, my question is would it be worth getting the tuner or should I just get an obd reader? I dont have any experience with flashed PCMs so I dont know what to expect. I do a whole lotta drivin in the truck so a little extra fun would be nice but are the gains worth the 150-200 Im lookin at puttin out for a used unit?