Quote:
Originally Posted by dslfrk
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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THat is such a small cat, it must be stiffling. Not surprised you have experienced more torque and power. I'd like to increase the exhaust pipe diameter throughout, and put a more throaty, thumpy muffler on it. The OEM is quiet with light throttle, but cracks on load. 4 strokes should thump, not "crack"
No complaints on power delivery, but more exhaust flow and a proper large bore muffler will make it sound like it should.