Made sure I saved both the OK tune and the GT's stock tune. I've actually been driving around a bit with the OK pcm and it seems to working fairly decent, tranny shifts are more firm than before but shift at right rpm. I haven't put my foot into it yet, not gonna push my luck until I figure things out. Luckily I have 3 pcms so I can afford brick a couple lol. No security light so far and only weird thing I noticed so far was that the emergency brake light came on for a bit, other than that everything seems to be functioning properly with the OK pcm.