At first I was thinking, no wy am I going to be able to perform this upgrade in less then 20 minutes, I mean, most manufacturers claim it will only take 30 minutes, but this often turns into hours. Well, it took me only 15 minutes! The directions are clear and easily understood and even someone without much mechanical ability will be able to install this chip in just a few minutes. Now, down to business- performance. I was skeptical at first about tooling around with the computer, but this upgrade can be easily removed in just a few minutes should you decide that you no longer want it (why you would do that, I don't know). Acceleration seems to have increased (I do not take my car to the track so I don't know exact numbers, but from the typical street scene, it seems to have increased)! Gas mileage is definitely up since I installed the chip. Prior to installation, my 93 Mark VIII was getting 11.9mpg on the street and 25.2 on the highway (the Mark VIII has a computer that tracks this info). Since installation street mpg has increased to between 13.9 and 14.1(I check daily) on the street and is up to 27.1 on the highway. (These numbers are consistent as I only use 93 octance everytime I fill up, so you can forget thinking that maybe I changed the gas that I put in). I am completely satisfied with the performance chip thus far!