Anyone try one of these on an 07 yet? Does it eliminate the 02 sensors?

 

I don't think the ThunderMax supports O2 sensors yet. Supposedly Zippers is supposed to be coming out with a version that supports and uses O2 sensors. I'm not sure if you'd have to upgrade to wideband O2 sensors or not. There's a thread (I believe in the Touring section) that discusses it.