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for cheap, start off just replacing the sub to a better one. OEM one's 'usually' aren't up to aftermarket standards. Some newer cars DO have great systems.
But replace the sub. If still dis-satisfied, then you can always add an amp.
Be sure to watch depth of sub you put in, and match impedance.
I pulled mine out yesterday while replacing the door speakers. I disconnected mine. On the Tahoe's its a 8'' not sure bout the Yukon. Simple to pull out....
I built a little ported box for mine and it boosted output quite a bit honestly i was surprised. i had left over wood from my box i built for my Fi sub im ordering and some spare time so i threw together a box thats about .65 ft^3 and 40hz was the lowest i could really get the tuning down to but it worked out pretty well. i can get a pic when my phone is done charging.
---------- Post added at 01:11 PM ---------- Previous post was at 01:10 PM ----------
and idk bout the difference from 01/02 but i just had my sub out 3 days ago and it said right on it 2ohm