[jgreene0717]

If you get a custom tune then you would have to send off your tcm and ecm. Or purchase another ecm and tcm so you could install your factory stuff if and when it has to go to dealership for service. That said I have a diablosport that I purchased through nelson performance and he installed a 87 and 93 tune on it as well as the diablosport tunes. The only thing is the diablosport does not support the tcm module (transmission). The nelson tune seems a little bit more responsive but the only true test would be to go to the drag strip and try it with both. I also had a superchips unit and if I had to do it over again I would just stick with it. Superchips claims around a 20hp on there 93 tune. That said it really depends on what other mods you do to the truck. If you plan on doing alot of upgrades then you would need a custom tune but for me I have only upgraded the exhaust and the handheld programmer does fine for me.