http://www.hypertech.com/products-results.aspx

I got off the phone with one of my more trusted vehicle consultants (outside my Immediate Jeep Family) from 4wheel Parts - Raleigh in regards to this little device right here. The good thing is that it is also available for the 3.7L engine. He said he's had this on two of his vehicles and they have both averaged 15-20HP more, and trusts the product. There are two others, but this one is the complete pack... costs about 279.99... 15 bucks for shipping... but I'll probably pick this puppy up on my way to visit Sal, whenever the sliders get ready.

Does anyone, especially you 3.7L folks, have any experience and similar findings for this product.

Features:

Speedometer\Odometer Correction For Gears 2.82, 3.07, 3.21, 3.42, 3.55, 3.73, 3.92, 4.10, 4.56, 4.88 & 5.13 (apparently not for the WK/XK though)
Speedometer\Odometer Correction For Tire Sizes 22.5 - 44 inches 1/4 inch increments
Cooling Fans Stock, 180 degrees F, 195 degrees F
Top Speed Limiter 25 - 75 MPH in 5 MPH increments, 81 to 255 MPH to match speed rated tires
Rev Limit -500 to +500 RPM
DTCs Read and Clear
Return Back To Stock
Internet Updateable

AJ