Originally Posted by BooBerry
Will you need to re-tune the car? I know on the 2005-10 mustangs they had those flaps and needed a re-tune. Think the 2012 focus has those as well?
Yeah im sure i will because it will probably change the way it runs and idles.
My car rattles because i need new motor mounts, not because i dont know how to adjust my stereo.