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Stage one doesnt make that big of a difference in the car for you to wait that long. Some people put Stage 3R kits on their cars the day they get them brand new off the lot. As long as you take it slow until 1500-3000 miles, then start getting on it, you'll be just fine.
I put on my S2 kit just after my first oil change at 3000 miles. Then it took me another 6000 miles to find and fix all my leaks and tune my waste gate.