Congrats, glad you made the right choice
As was stated previously, the Challenge rear grill will definitely help with cooling as the engine bay gets very hot (larger holes than stock). Also, after driving, I always open the engine hatch to help cool things faster as well.
You might want to consider getting the 19" BBS Challenge wheels that come on the CS if you want to modernize it a little. Novitec and Hamann also makes some great "factory" looking wheels too:
Novitec:
Hamann:
