Some important things that matter before deciding on what type of big power mod will meet your needs: * Why do you want more power? In what kinds of situations do you feel that you are lacking power? * Have you re-geared your axles with a good match for your tire size? * Since you drive a manual transmission, consider paying attention to your shifting "style". Are you trying to drive your Jeep like it has a big torquey V8, keeping RPMs low, and then getting disappointed at the low RPM performance? The Pentastar is a fairly high-revving engine, and torque below 2000 rpm is kinda weak. Experiment with changing your shifting style to rev the engine higher before shifting, and downshift more when you want to accelerate quickly. Don't be afraid to run it up to 6400 rpm at full throttle when you really want to accelerate. * Similarly for off-road driving, are you keeping RPMs low and disappointed by the performance? Try making use of 4LO and low transmission gears when driving slowly off road, keeping RPMs above 2000 in the mid-range whenever you are in a situation that may require throttle response and torque. If you are often in situations where 4LO in 1st gear still has you lugging below 2000 rpm with inadequate torque/power, then consider whether you should go with numerically higher gears in the axles, or maybe you need the 4:1 Rubicon transfer case. Just some ideas that might help you enjoy your Jeep more at much lower cost than a V8 swap or supercharger. My opinion is that making use of gears for torque multiplication is the best way to improve off-road performance, and bolt-on supercharger/turbo kits are more for improving on-road performance (acceleration onto freeways, passing, etc). Turbos make some pretty fun noises when getting on the throttle, but stay nice and quiet when driving gently

I really need to get video of how mine sounds with its current setup. Here's what the Garrett turbo sounds like with the stage 2 kit (with blow-off valve) while drifting in the snow. I now have a Precision turbo that has a different sound to it (and spools more quickly than the Garrett).
http://www.youtube.com/watch?v=_kfYyeRwRSI