Originally Posted by bigaudiofanat

You should NOT keep the factory tweeters wired up during the usage of new speakers as you could have a ohms imbalance and fry your internal amp of your head unit.

You should either disconnect them or order a component set of speakers.

Adding new tweeters will also not be a good idea as you need a crossover to block them from getting damaging bass frequencies that a tweeter can not reproduce.