Old post i know but I'm replacing the speakers in the front doors. Not messing with the rears since i pretty much made the rear signal into subs. I'm buying infintys 6.5 2-ohm for the doors and my question is, when I replace the tweeters am I going to need crossovers for those or is there already one preinstalled for the factory tweeters and won't need to mess with it? Thanks!