i drive a mitsu lancer which comes with 61/2's all around. My friend drives a benz, which has 4 inch speakers in the front and 6 1/2s in the back, with 2 subs an tweerters; all of which are bose. do you think it would be wise for me to switch from my system to his system. that would mean me reducing my front speakers to 4 inches. what do you guys think?