Wow, I just installed a 63mm Throttle BOdy, and wow what a difference. I had an FIPK and Gibson cat back exhaust which had improved power but it still was sluggish in the mid range and a little slow on the throttle repsonse. Well with the 63 mm TB all I can say is wow. Throttle response is 100x better especially in mid range and off idle and WOT is also improved feels snappier and quicker in acceleration. Here is the one I got and it does not whistle and looks to be a top notch job on the bore.

Another plus, my Jeep no longer feels the need to downshift on the slightest grade and when it does it is only for a few moments, used to shift down on any hill to maintain speed and would not return to overdrive until it was past the incline.

Item title: Jeep 62mm/63mm 4.0L & 2.5L 1991-04 Ported Throttle Body
Web Address: http://cgi.ebay.com/ws/eBayISAPI.dll...m=250207633132

 

Just an update, I am getting 13.4 mpg average. That is with my huge roof rack, I know it robs about 2 mpg. That is 90% in town driving or short runs. Goin gto asheville next weekend will see what it gets on a long highway run and post then.

Really loving the extra power and torque, I can definitely tell the difference, better driveability and puilling power when hooked to my small trailer.