I think that many people get a CAI and catback exhaust for the brand, looks, and the sound. Some may get them for the the primary reason of performance. The uprev tune really gives nothing worthwhile in return compared with the Hondata Flashpro for instance. Just for reference, here is a video of a Civic Si I/H/E vs a Civic Si I/H/E/Flashpro. Can the uprev do this?
http://www.youtube.com/watch?v=Vs-jmXoDlXE