My little brother is going to buy a 2012 mustang with the shaker 500 stereo option. He is wanting a little better mids without cutting up his car. No amps no wires, no subs. The front doors have stock 6x8's but it looks like most higher quality companies don't make a 6x8 but it a appears that 5x7 interchange in the holes. I found a set of Image Dynamics CTX 57 and some Polk MM571's that are both in his price range. Going on the tendancy that he gravitates toward warmer basy heavy headphones and eq's everything in that direction, I recommended that ID's going off that the reviews I have heard from the rest of their line. Was I correct in doing so? Are there any other low wattage coaxial speakers in these sizes that I am missing that can be had for sub $150. I think the stock HU pushes a whopping 12 rms.