My husband loves "Car and Drivers". It keeps him up to date on all the new cars that have just come out and what the future cars might be. They have some fun testing results that I even enjoy reading along with other short articles about car upkeep and new "toys" that can be gotten for your car (stereos, lights, wheels and so on).
Maxim to me is a trashy magazine, a milder playboy type with some "sexy/funny" articles. Personally would not get that for my man or even guy friend, then again I am not a fan of the Cosmo, Glamor, ect that are put out for the women. Maxim really will have nothing related to cars or stereos if that what you are looking for.