E90 M3 Weird Resonating Vibration at idle

[Skylinehead]

Hello guys just picked up a E90 M3 and I'm having this strange issue, check out the video, it only happens around idle rpm. It is actually happening throughout the entire video except those times when I rev, but the phone can only capture the louder vibration.
The car has stock exhaust with NO cat, that would not be the reason, would it? Also I checked the engine mounts I think they are good unless they are some black solid mounts!??

[Skylinehead]

I think there was another guy who had the exact same issue but that post didn't come with any final results.
https://www.e90post.com/forums/showthread.php?t=1196647

[Redd]

Have you checked exhaust heat shields? A lot of times, vibrations or resonance was due to a loose or bent heat shield touching the exhaust pipe.

[ScoopALoop]

Originally Posted by Redd

Have you checked exhaust heat shields? A lot of times, vibrations or resonance was due to a loose or bent heat shield touching the exhaust pipe.

Exactly right, I had a similar issue when I swapped exhausts and the issue was down to an exhaust shield touching the O2 sensor.

[amrazM]

its possible if the exhaust was chopped up to delete the cat the exhaust may have not been welded straight, check the condition of all rubber mounting points throughout the exhaust system. there are two at the rear muffler, two on the connecting pipes on the diff and two in the center of the car at the brace.