E-Force Supercharger Systems - Jeep Wrangler JK - Edelbrock, LLC.
"Oldfart" sorry my error the other day I said 3.8 its a 3.6. I get confused with those newer stuff mind stuck with 4.0 or actually a 3.99 TJ.. Thought you might like this site about supercharging. Anytime you like to start??

 

You get better fuel consumption by turbocharging, but only if you can keep your foot light on the loud pedal.

 

Like better fuel mileage place an EGG on it..... thought that was hilarious :)