Go with the mud-lites. My brother has the same bike. We just put some new 25" mudlites on there and he can keep up with the 4x4's - no problem. It really made a difference. You have to remember this is a 20 yr old bike, so to put some gnarly, meaty, heavy tires on there would be too much stress on things.
What a bulletproof bike though. I've seen my brothers go through some amazingly huge mud holes. A lot of it is rider skill, but you won't be disappointed with the mud-lites.
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