Blackcoog
Hard-core CEG'er
I thought this was interesting. It's a roots blower mounted down under the motor. It's from 2011 but I've never seen it before so maybe others would like to check it out:
http://forum.mazda6club.com/3-0l-v6/247891-mazda6-v6-diy-supercharger.html
http://forum.mazda6club.com/3-0l-v6/247891-mazda6-v6-diy-supercharger.html