I installed a Valair 3850 dual disk not too long ago, and have had a resonance at about 1600 rpm. It only happens when you are pushing it harder than normal acceleration. It is like a short high frequency vibration from 1600 to about 1700 only. Has anyone else experienced this?

 

Mine does the exact same thing.

 

I have heard the same thing from a bunch of folks since I posted about it. Apparently it is normal, and you either drive around it or install a new harmonic dampener.