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HKS (or apex'i, can't remenber which) have a butterfly valve you can put into your exhaust (say between the cat and rear section) which can be adjusted inside the car. So when you have to keep it quiet, close the butterfly, otherwise keep it open. I'll try and find the link.

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https://www.sau.com.au/forums/topic/20215-exhaust-silencers/
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