Guys, I am now moving my attention to the interior and have a Sony MEX stereo with lots of power, I want to upgrade the speakers but not sure what to use, the car doesn't have an amp, (I think) I believe 5.25cm speakers for the front are correct but what can I get away with in the rear, I am quite happy to enlarge the holes to take bigger speakers, also not sure wether to use coax speakers or tweeters, I just need quite loud and clear not ear splitting with boom boom bass