I had a the vibration or rattle sound 1st-2nd 3rd-4th, but not so much any more. It was very annoying sounded like a metal shroud rattling. So the other day I removed the resonator tube from under the AirBox and the noise was gone. I reinstall and hit it and sure enough it was vibrating against the sub-frame. Put some foams in between and eliminated the rattle. There is another somewhere but i think it is the heat shroud under the catalytic converter. Gonna add some sound damning material to that soon.
White Platinum Tricoat Metallic
2012 Ford Focus Titanium
Handling Package Nitto Motivo's
Borla Exhaust with UltraQuiet resonator
K&N X-4870. Steeda RSB