I'm almost sure it's 2.25" diam.
On my 88 RR I ran a flowmaster (series 50) in the rear and 3 gutted Cats. It sounded a bit throaty but bearable. You can hear my RR on the Dweb Back East, it's the white one going up a hill in Wurtsboro.
I'm installing the Janspeed System (headers, y-pipe, etc) next week. I'll let you know how it goes.
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John C
1996 DI - 3" AG lift
1995 DI - Scorpion Racing Extreme Kit
1991 RR - parting out (few parts left)
1990 Kawasaki KL650B Tengai
1989 Kawasaki KLR650
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