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Hi,

Initially I have a 3" cat back exhaust system. Yesterday I just put on a 3" dump and front pipe (turbo to cat) to make it a complete 3" turbo back exhaust system. However after that when I took it out for a drive I noticed everytime I changed gear at 3000 RPM or more the exhaust made a sound ("boof").....like a backfiring sound....the same thing happened to my friend's S15 but at very high RPM (e.g. 5000RPM)....Does anyone know whats wrong? thanks..

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https://www.sau.com.au/forums/topic/82222-weird-noise-at-3000-rpm-or-more/
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