I know you mentioned that it happened after doing the hfc, but I did my cbe and hfc's at the same time, for weeks had a weird vibrating noise that a few people had NO idea what it was.
After getting underneath the car in my driveway with the car on, there is a tiny heat shield? or tin flap that comes down near the cans on the passenger side, and it was vibrating like hell against the cans, bent it a little bit, and solved the problem.
For those of you who've never looked there, check it out, it might help, or it might not.
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2009 Touring & Sport Package || Platinum Graphite || 40% 3M Tint || Xpel Clear Bra || Berk CBE || Berk HFC || Stillen Sway Bar || H&R Spacers || Swift Springs || SPC Rear Camber Kit || Thanks to Savage Autosports, VTR, PM, and R.A.D.
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