I now have both, my personal opinion, snatch up an idi. Tuners are probably great and all, but I love the simplicity of an idi. My dd is a 91 f250 with a 3582 turbo, intercooler, 110 cc ip, stage 1 injectors, 3.73 Yukon gears, and a zf5. Walks all over the powerstroke loaded or unloaded. Stomps...