2018 Ram 2500 4x4 Laramie 6.7L
Hey everyone! So I just bought a 2018 Ram 2500 Laramie 6.7L. It has a CSP5 tuning switch from Fish Tuning. Truck is physically deleted and runs great. But I noticed there doesn't seem to be a difference between the switch positions as far as performance wise. This was a 1-owner truck prior to me. So how can I tell if they tuned it or not? I'm trying to figure this out in the most cost effective way and trying to avoid buying a tuner for it. Any advice is appreciated!