Yeah, fast intentions are much more popular in the US. I like the idea of resonated cats because they cut out the rasp and hiss. I found a video of them on a G35 with an invidia q300(pretty close to a gemini?). Sounds amazing, id like to see how they sound on the 350z with a invidia gemini.
http://www.youtube.com/watch?v=5ULVuOnNhB0
http://www.youtube.com/watch?v=uNlxfOikZGA