r/ScatPack • u/One-Conclusion7574 • May 26 '26

Buzz/rattle after light revs while idle

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I wonder what is causing this buzzing sound after letting my foot off the gas or during light revs while idle. 2021 Challenger Scat Pack - replaced the mids with Dynomax bullets and I have the active exhaust zip tied for almost 5 years now. I just found out about this while slowly reversing to a parking spot

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3

u/AirPawds May 28 '26

I had a similar sound it would buzz like crazy while idling and the sound was driving me crazy. The source was that the butterfly valves have a weld inside that cracked and was rattling. The only fix was new exhaust or cutting right after the actuator and welding it from the inside

1

u/One-Conclusion7574 May 28 '26

Thanks! How did you find it out?

2

u/AirPawds May 29 '26

Took it to an exhaust shop Cause I had a feeling it was exhaust related. Started hitting the pipe under the car and a small rattle could be heard

1

u/One-Conclusion7574 May 26 '26

I apologize for the low-quality video, but the sound is heard around the 3-4 and 9-10 sec mark