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Hey guys

Just bought an series 2 NA 33. Anyway the stock muffler has dual tips as u know, but one of the tips has a butterfly inside that is connected to a cable, pretty much exactly like a throttle cable. Anyway i can pull the throttle cable manually and you can hear the exhaust get louder, so i just wanted to know when/how is the cable activated when driving? When closed does it reduce power at all or just noise?

Thanks dude's, i've just never seen that before

Simon

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https://www.sau.com.au/forums/topic/85143-stock-exhaust-question/
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