More than enough for any tweeter, unless its a bullet tweeter. Typically you want the tweet as close to the mid as you can get, yet further away from your ear than the mid (thats why our factory placement sucks balls). The tweet in the mirror cover, was an awful decision from the factory. Our cars basically need a three way system. I would go with the A pillar and aim it so the sound bounces off the windshield to the passenger and vica versa. This will slow down the time the high frequencies reach your ear, and allow the mids to catch up.
