Sure do.
I just came across these a few days ago and i like them
http://www.madebyamateurs.com
http://www.youramateurporn.com/archives/archive_2008-w13.php
I have a QTP on my car and use it all the time. I have my cut out rebuilt about once a year and it's about $30 to have them rebuilt.
If you want you can come look under my car, I still have the stock cat back on my car. I love having the option to make the car quite if needed.