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Those inserts don't change the sound a whole lot imo.
Just adjust the screw on top. If it's backed out, the air will release easier and will have a longer sound.
If the screw is tighter, the sound will be tighter and quicker as well. At least on my car this is how it works.
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R35 GT-R, R32 GT-R, Supra, S13, S14, FD3S
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