Originally Posted by Bryan23ferra
I've been looking at getting a HO one for my 2011. When I hit hard the RPM's drop noticeably or when I roll up the windows, turn on the lights, ect. the RPM's drop and I feel a little shake as well. I had ford check it while still under warranty and they said its fine. But now Im no longer under warranty, I dont want to get left stranded!
And I would not worry about this as mine did this even when I had taken my system out for a while. I would sit at stop lights and hit the window button just to the the rpms fluctuate lol