Relax... Driving in the rain at the track is just like driving in the dry, only slower.
Be smooth, smooth, smooth... ease into the brakes, and ease off them.. same with the gas.. smooth on, and off... look way ahead and slowly build speed.
A good day in the rain will teach you tons, since the limits are lower it is safer to explore them. I love being at the track in the rain, you can learn more in a wet day then 10 in the dry.
Marc
Good advice. AWESOME picture of your box in the sig, looks like its gripping hard.
With M030 and R-comp tires it's going to feel like a whole new car. Don't try turn 8 at 120mph . Just take it easy, pay attention and drive safe. Getting coaching in the rain should be great.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.