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FYI when sound increases by 10 db the subjective response is a doubling of loudness.thus an increase from 60-70 db=twice as loud.decibels are on a logarithmic scale.a pipe that controls high frequency(hz) better will not be as "ear"atating.stock street motorcycles are 80dba per EPA guidelines(epa title 40 part 205)most pipe mfgs should be able to provide you with a db rating of their product.this rating should be done using the EPA drive by test for compairson purposes
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