You guys are way more familiar with the tuners then I am, but I can tell you that I've been running an early Stage 4+ tune from Livernois since July of 2011 without any problems and the performance is fine. I know I checked a few months ago, and LMS told me that there was no update to the tune I have, but I am completely satisfied with this canned tune, and I would be really, really surprised if there would be much "seat of the pants" feel with the MyCal vs the SCT tuner that I have (although without looking-I'm not sure which model tuner I own).