Installed the Cobb RMM after work today. Great install instructions avail on the Cobb website. There is noticeable vibration at idle to about 1300rpm. Smooths out completely above 1500rpm. Not as bad a vibration that our 2010 Focus SEL has stock tho. Did a couple quick runs with it, really helped with the wheel hop, and couldn't get it to bang 1-2.
Factory mount with 1000 miles. Poorly designed, already blown out.