TC Bros. Yamaha XS650 Builder Exhaust Kit 1.5 Inch DiameterTC Bros. Do it yourself exhaust kit for all years of the Yamaha XS650. Kit Includes 2 flanges and collars to fit your stock XS650 head, 2 mandrel bent 90 degree pieces, 2 mandrel bent 180 degree pieces and 2 straight length pieces. Tubing is 1. 5 inch diameter 16 gauge mild steel and is bent on a 3" Centerline Radius. Flanges are 1 4 inch thick. Plenty of material is included to make just about any custom exhaust that you think of! Made in the USA.