dash and front windshield

wondering if there is enough room to take the heater vents out while the front windshield and dash are mounted to car. reason i ask is i have the dash out to wire it and will be installing windshield once dash wiring is done. I'd like to install some tweeters where the heater vents are (not running a heater) so wondering if i can install them later on when i do the stereo and speakers.
Author: admin