If there is racing in your blood, take a trip to the Sepang F1 Circuit, located near the KLIA airport.
There's probably something going on at the circuit almost every weekend, but check their website out for stuff. If you have access to a car/bike, you could also have a go at it around the circuit!
You know when you watch F1 on TV; maybe sometimes you lower the volume? Well raise the volume at most then imagine the sound 70 times worse... Now maybe you can get the grip out of it ;o)
It is actually a great feeling when the cars are racing by you, you will hear their engines all the time but when they pass you everything vibrates and for a moment there you won't hear anything else and after a few seconds they are on the side of the track..