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I have a 84 GS 1150ES with a Yosh 4-1 pipe now, but the the pipe I had before the Yosh pipe was a Kerker 4-2 pipe which was designed for a GS 1100 in mind because the header pipes were smaller than the exhaust port!! Not good for exhaust flow 
I noticed when I took it off to replace an exhaust gasket and saw carbon on the pipe surface that mates to the gasket... It was about an 1/8 inch wide black band around the outside edge of the mating surface..... The inside diameter was much smaller compared to the Yosh..... The Yoshimura pipe made it run a whole lot better 
Don't know if Kerker just figured the ports were the same size ... :roll:
Did anybody notice this? I bought the Kerker pipe back in '86 and the Yoshimura pipe around 1994 ...
Alan
I noticed when I took it off to replace an exhaust gasket and saw carbon on the pipe surface that mates to the gasket... It was about an 1/8 inch wide black band around the outside edge of the mating surface..... The inside diameter was much smaller compared to the Yosh..... The Yoshimura pipe made it run a whole lot better Don't know if Kerker just figured the ports were the same size ... :roll:Did anybody notice this? I bought the Kerker pipe back in '86 and the Yoshimura pipe around 1994 ...
Alan