Getting a re-tune on my LS6 T/A monday, Chris(NJTorque) and Larry(SamhainRS27) had theirs today and I'm getting psyched up now! It has a tune in it but I think it has a little more left in it. It's currently at 385rwhp/381rwtq and the original owner Matt, an employee at New Era Performance in NY said they just put a 1 run basic tune in it for me.
Anyway, I was wondering if anyone had any tips to prep for the tune. I changed the plugs(after filling up a Swear Jar

) & cleaned the K+N, but what else, if anything, should I do?
I just want to make sure the car's running PERFECT when it gets done.