Ok, so I was thinking about adding one of those power chips for some added power to my 93 YJ 4.0 automatic. I see a wide price range of sorts for these chips. From $20+ dollars, all the way up to $500. I want to get the best bang for my buck. So does anyone have suggestions as to which chip is the best bang for the buck? Some of these chips claim a lot. Both in power and efficientcy.