Have'nt heard of that, would be sweet if it worked! I too suffer from the 2.5 lo-output motor. Just some advice, I have put on a cold air intake, bored throttle body, throttle body spacer, header and flowmaster. All of this made a little bit of a difference, mainly at mid-range. I then put 4.88's in it and that is when I noticed the biggest difference. Just my 0.02.
Welcome to the forum, great group of guys and gals that are a huge help!
1999 TJ 2.5
Aftermarket Header with Flowmaster
ARB Safari Snorkel with Airaid box
TB spacer/Bored out TB
4" Rough Country Lift
33x12.50 Maxxis Bighorns on 15x8 Cragar Soft 8's
Classic Rock Rear Bumper with Tire Carrier
Custom front bumper
1998 BMW 328i (Wife's)
Upgraded sound and DVD players
2003 Honda RVT1000R (RC51)
Adjustable steering damper, fender eliminator, led's
2005 Kawasaki Vulcan 500 (Wife's)