I added the sub thump system with sub.....sounds better....but the BA Speakers still suck.....and you loose your center channel with that system.......still not impressed even after the upgrade...better than stock..but I grew up with a brother who built car audio systems back in the day...so I know what awsome sounds like.....Sub Thump in a zl1 is not it. I would spend the extra money if the stereo system really is that important to you and get a custom install somewhere with all new speakers, amps, subs. just my opinion.
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