More power is always going to result in cleaner sound when you turn it up but the interior speakers are already quite good with sufficient power IMO. The sub on the other hand could use about 3x more power, and should be at least a 10in. When I crank it I can feel it a bit from the doors, not from the sub. That's impressive from the doors but embarrasing from the standpoint of what a subwoofer is supposed to do. The whole point of the sub is to handle the low notes so that the mids and highs can play loud and clean without distortion from trying to play low themselves.
