the computer chips don't provide any noticeable gains in HP, fuel economy, or anything else. i had a jet stage 1 chip in my tj which i bought for $300, and i thought it was the best thing ever. a few years later, i decided to sell it for $$$ for some upgrades for my CJ. now that it has been off for over a year, i noticed that it didn't change a damn thing. i guess i didn't want to admit that i just wasted $300.