This is what we (eaglegirl and I) have decided to do to the SX4. A friend of mine did this to his cherokee (my cherokee now) right before he wrecked it. He used the cheap duplicolor roll on bed liner from walmart. It has held up very well considering the amount of abuse it gets (flaked a little). It is really not that noisey in the jeep, a little more road noise, but not obnoxious. An added bonus to this, my jeep leaks water like nobody's business (it has been wrecked from front to rear, lol), so having no carpet has keep the "wet dog" smell away, and also helps keep the floors from rotting out, being that I can remove the floor mats, and let it dry out.