I have a 2k2 max and a stock headunit (non bose). I have a adire shiva subwoofer but want better sounds from the other speakers. How are the CDT Audio Classic "slim" full range speakers(2 way)? I can get them for pretty cheap and am thinking about using four of them for all the doors and leaving the stock tweeters in. How will that sound? Will they fit? they have a mounting hole of 5 11/16" will i need to modify?

I don't want to spend much, so I am thinking about 50 for a pair, are the pioneers, kenwoods, polk, RF, infinity..etc around 50 a pair better than cdt? I am willing to take any suggestions.