I got the Stillen Cat-back exhaust installed this past Friday. First impressions are that the tone is sligthly deeper/throatier, but not much. I believe this will improve as the mufflers burn in. Another observation is on the Stillen tips. I didn't like them - they don't have an off-set cut, and I don't think they go with the character of the car. So, I had them removed and put Corsa tips on....I like it much better. It does sound best under heavy acceleration. One tip - if you don't want visible chrome hanging down behind the rear skirt, get the mufflers and exit tubing painted black.
I uploaded a video/sound clip you can access via the following:
http://s238.photobucket.com/al...5.flv
I did install the Fujita dual air intake as well.