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If you look in the older threads, somebody has pics of holes drilled in the mufflers. I drilled 6, 1/4 inch holes through both outer end plate and inner baffle of muffler. I had cat-bypass pipe and ran 20054 tune. The holes added a little more volume, that was good for a while. I soon needed more and went with the TORs.
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Ride hard, die old.
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