I HAVE INSTALLED THE OBX HEADER BUT NOT THE ONE IN THE PICTURE. i DID NOT HAVE TO NOTCH MY FRAME BUT DID HAVE TO EXTEND THE FLEX PIPE. THE O2 SPACER IS ONLY ABOUT $15 ON EBAY. I HAVE RAN MINE FOR ABOUT 3K MILES AND NO CEL.
It is what it is in life... Just have fun with it!
January 2012 Ride Of The Month