If you buy the Polk DB525's Crutchfield includes the adapter plates for the fronts and the pigtail wiring so you don't have to cut anything. Personally, I've run 6.5's in the pods and went back to 5.25's, because, 1. I also wanted to retain the factory grills, and 2. they are literally 6" from your ear. You aren't going to gain much with a bigger speaker in that location. Add some polyfill to the sound pods and dial the fader down for the rears to improve your sound stage a little. Without a subwoofer you won't get the full range of music, so it's a compromise.