I liked the idea of the supercharger initially. I am not convinced that the OEM parts could handle the additional strain offroad.
The one offered by
Predator looks tempting:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
Hummer H3 Supercharger by Predator
Boost your H3's performance with this Supercharger by Predator Motorsports! This baby provides up to 308HP, 315 ft/lbs of torque, and up to a 40% power gain. Can be installed in as little as 2 1/2 hours. </div></BLOCKQUOTE>
Diesel would be a great alternative. The litle jeep liberty comes with a diesel option. It has a great deal of torque for the trail (considering its size).