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just installed a 3" hi flow cat to my car last week

and ever since i installed it... its been making weird noises every now and then

the noise is when i dont have my foot on the accelerator... sometimes when just idling waiting for a traffic light? it sounds like a something is rattling inside... sometimes it sounds like something is bubbling

weird thing is that it feels like the car is close to stalling... it stalled once already

does anyone have any ideas what this weird sound could be?

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https://www.sau.com.au/forums/topic/114439-weird-noise-with-new-hi-flow-cat/
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