With the LCG kit and the hot ticketed proper tires, you'll be well on your way to those practice sessions to learn roll control. That's just for starters. Diff fluid, shock oil, servo, sensored motor/ESC, radio, sway bars, etc., etc., etc., can be dealt with later as skill, knowledge, and competitive nature sets in. If the track is doing a spec class Slash thing, then maybe hold off on a LCG upgrade and tires.
I haven't raced in a long time but showing up to a new track for the first time; with the wrong tires, is not fun. Find out beforehand what the rules/classes are, and what tires are being used at the track. This will make for a successful/productive enjoyable first timer visit.
Not knowing what your expectations are for the Slash, but I'm sure you'll get the "taking a knife to a gun fight" remarks somewhere along the line if the setting is right. Yes, trying to run a stock Slash with a pack of the latest and greatest SCT platforms available will be an uphill battle. There, I said it. Hopefully, the dudes at the track aren't jerks with noses in air, and/or the track has a "run whatcha brung" class for those just getting into racing.
