You've probably seen them on Ebay for 28 bucks + shipping. They are resistors in a plastic box that you wire up to your IAT sensor. Supposedly they advance timing and air/fuel is adjusted. Sold as custom for each make - Jeep, Chevy whatever.
I read the feedback on some of the people selling these "boxes" and the reviews are mostly good at least in terms of shipping timliness
Nah, but it's the usual 2mpg mileage drop and I guess some performance improvement. May or may not have to run high octane fuel. Some question about whether the performance improvement lasts or whether the ECU returns to stock after a period of time.
(I know you can do the IAT mod where you relocate the sensor away from the intake/exhaust manifold and technically lower the termperature received at the sensor) Think there was a post on this subject here before but I couldn't recall any search terms.
Think these IAT box things are called, White Lighting, Juice Box, etc. No chips for the YJ 2.5s so thinking about it.
