If you read the first post, Khoi clearly mentions that it will have to be resonated for both stock muffler and short tail users, because as short tail owners already know, they're extremely loud compared to the stock setup and even most aftermarket catbacks.
So yes, of course it will be resonated. Last I checked, he wasn't trying to sell this to road racers.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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