Finally got a chance to take the RZR out since doing my intake modification. There was absolutly no increase in noise level. It is hard to tell without a dyno, but it appears to be a little more responsive due to increased air flow. The big difference, absolutly no dirt or debris in the air box.
http://i221.photobucket.com/albums/dd96/redrzr/Grill012.jpg
http://i221.photobucket.com/albums/dd96/redrzr/Grill012.jpg