If i hook up 2 comps in the front of my car with the tweeters, and hook 2 up in the back without tweeters, will the back ones be louder since the power doesnt have to divide between tweeters?
According to that plan you won't need to run anything but mid-woofers in the back, so it's technically not a component set. Leaving out the tweeters is going to make the sound lose a lot of detail back there, plus tweeters don't need a lot of power to sound loud. The front speakers should sound louder. I'm assuming you have multiple sets of identical components, and all channels will have the same amplifier powering them at the same nominal impedance.
You are correct, and i wasnt quite sure yet if this is what i was going to do, but its always been a wonder ive had that i couldnt find on google, because im planning on amping them to 85rms but i definitely dont think the tweeters would be pushing 85 out of them you know?