Here's a question for the Yosh guru's. I just purchased a Duplex and I am having trouble finding out exactly what it is. The mid pipe is stamped R775RT and the header pipe is stamped R775RH at the collector. Anyone have any info. they can share. Here are a couple of pics.
http://i198.photobucket.com/albums/aa84/Almaguin/GSXR/P1010061.jpg
http://i198.photobucket.com/albums/aa84/Almaguin/GSXR/P1010058.jpg

not nearly the yosh expert here, but I believe this graphic from another member will tell you what you need to know.