I really need help with this one. I'm trying to get more speed out of my '99 Jimmy, but the problem is I don't know what I can and cant do because of the internal computer. I know I can use a power programer but I'm not sure what kind. I also want to put in a cold air intake but the stock intake looks likes its two parts with a sensor in between the two parts. I don't know what to do with that sensor if I put in a AEM brute force cold air intake. My last concern is the muffler. I know that a straight pipe would ruin the computer so I was thinking about putting in a flowmaster performance muffler but I don't know if that will mess up the computer too. If anyone could help me out or give me advice on something else I can do to get the most out of my Jimmy (besides a supercharger) I could really use the help.