Thanks for the reply. My 2006 vtx 1300c had Vance and Hines pipes on it when I got it and a friend gave me a set of stock pipes from a 1300n. I have them installed now and was wondering about weather I needed to have the PAIR valve with a cat. Who ever put the pipes on left the PAIR valve on. It doesn't look like it has ben messed with. I am getting ready to go over everything since I have no idea what this bike has had for maintenance. It does seem to be in good condition.