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the smaller the motor and the larger the percent of power available used the more important the muffler and pipe flow becomes, also the less aerodynamic a vehicle stands to reason your using more power per mph thus need more flow also. many high perf mufflers are very restrictive to air but not the noise, look inside a cherry bomb muffler and see the small pipe size , yet not very quiet. noise reduction and flow reduction not the same thing.
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