I don't think it's the cats.
You don't mention if you have a lift? Did you check the u-joints on the rear driveshaft? Did you check the TC bearings, pinion bearings?
I would remove the rear DS and drive around and see if the vibe goes away. If it doesn't then remove the front one.
Good luck.
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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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