The 6x9's are mounted on the rear deck from the bottom. When I bought the car the orginal owner had a cheap (very cheap)pair of 6x9's already installed so I didn't have to do any cutting. I don't have any Dynomat installed, but I am sure it wouldn't hurt. Has far has rattles, from the inside its not bad, but when you stand behind the car with the radio playing it does rattle the trunk pretty good. So I figure how many times are you going to be listing to the radio from behind the car? I just got the 10 two weeks ago, and noticed today it broke in and all I can say is OMMFG!!!!! It does not hit hads hard has my brother-in-laws 2 12's, but considering its a 10 being pushed by a 60x2 amp not to shabby. I am going to replace that amp with a 250x2 when I get a chance. If you have any more questions just ask. I am by no means a pro but I enjoy a great sounding stereo along with a great sounding V8.