Just got done cutting out the cat and replacing it with 1 1/4" flexible exhaust pipe and 1 1/4" stainless steel band clamps. What a difference! Lots more midrange and doesn't make it much louder. Much more fun to ride. Saves a little weight also. At some point I will have to rejet from a 125 main to a 130 as it is now running a little lean.
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