I have a 2013 300C luxury series, and am going to replace all the factory speakers. As far as I can tell, there are 2 3.5's in the dash 2 6x9's in the front doors and 2 more 6x9's on the rear deck, and am thinking of adding a second pair of 3.5's in the rear also. Probably going to go with Rockford's for all of them, P1692's and P132's. Where I'm struggling, is amplification. I want to push them all pretty hard, which is easy for the 6x9s that's not so much of an issue, but the RMS for the 132's is only 40 watts. Should I even bother getting an amp for them, or just run them off the stock head unit?