I don't think any of the exhaust systems have been shown to add power or MPG. I believe they simply change how the engine sounds. I haven't been in enough jeeps with exhaust systems to make a decision on which to buy for Jesse's Girl. The youtube sound bytes just don't do it for me. I want to hear it for myself; probably why I've been "thinking about it" for over a year.

Don't discount AFE's systems - they are pretty darn nice.