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I've used these exact muffler's on 2 different 800's. In my experience I didn't feel like they were excessively louder than stock. SLP says this is within 2 decibel's of stock. Like Darth said if noise is an issue for you go with the Super Silent Muffler that is 5 db quieter than stock. And yes there is a small improvement in horsepower.

FYI... SLP says this exhaust is 90 dBA using SAE J1287 test. 96 and above is a fail and will get you a ticket in Moab.
 
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