I'm going to get after my boyfriend about his driving
Is there a problem with his driving?
I don't like it when he drives like a maniac.
If you don't feel safe while your boyfriend is driving, you have every right to speak up. He may not realize how you feel and will be glad that you brought it up.
I heard that he is bad at controlling his anger while driving so I will make a big deal about it.
Your concern for your boyfriend is probably warranted in this case, however, you should be careful not to make it sound too critical.  If your boyfriend gets mad at you in response, he might not change his behavior.  Let him know that his actions make you feel unsafe, and he will likely improve.