I'm in Europe until the end of May, and I'd like to see what oppo's recommendations are for the best car related things to go see while I'm here. I've already done the Porsche and Mercedes–Benz museums in Stuttgart, and am attending the Rallye de Monte Carlo Historique in January.
My budget is pretty flexible, although for the most part I'm too young to do something like rent a car and drive the Nurburgring. Other than that it's wide open, suggest away!
Here are some Porsche engines for your troubles