in a soft top/no top wrangler either you wouldnt notice if because of wind/road noise or it would saund like crap because you would have to have the vol up so loud to hear it. i would build a box that fits inside the can then it wouldnt matter.
Ya, basically, it's a poor idea. But it can be done... Dynamat or some other type of insulation for the metal will be critical.. Best option would be to create a box within the box ALSO (still need the insulator for the metal) to get that air-tight seal that full-range speakers need (unless designing a full-range vented design, which is a real pain in the behind...).
If you can't take a nano-second to press shift/period/etc. and make proper sentences and paragraphs, I don't know if I can take a few minutes to respond to your topics... It doesn't have to be perfect by any means, but a little effort goes a long way.