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As far as I know the quietest is the Suruga Performance one
Then comes the HKS but it is only a muffler for now
then for the cat back ones I would say
Quietest > ISS street> JoeZ > ISS race > Borla > loudest
Agreed... i dont think the HKS is quite at all. Joe Z with cats is the way to go with daily grind
 
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