Not the header. the 450 muffler and mid pipe are what you need. Mine was a White Brothers, it had the muffler with two inserts on the back, one was an open tip and the other called a quiet tip. It sounded perfect with the quiet tip in. the mid pipe slid into the front of the muffler and the ID of the mid pipe was a slip fit over the head pipe. I cut the head pipe and mid pipe to get about a 1" slip fit and the welded the two together a ground it down. looked like one continuous head pipe that would come apart at the front of the muffler. It looked big in the pics but it never hit anything or got in the way.
Ross..
My Rides
1985 250R original (Garage Queen)
-under restoration
1985 250R black and blue full rebuild ( Daily Rider)
-Paul Turner pipe
-+2" Westcoast
1985 Red and White Tecat-EH Sold
1985 Green Tecate Sold
My Wife's Ride
-2003 Suzuki LTZ 400 Showroom fresh and completely stock
My Kids Ride
-2004 Yamaha Blaster, Completely Stock
-2006 Yamaha Blaster, Completely Stock