The Ford Sierra XR4 Is Angry... Very Angry!Murilee Martin12/27/07 1:30pm40EditInvite manuallyPromoteDismissUndismissHideGo to permalink We knew the double-winged turbocharged Ford Sierra as the Merkur XR4ti on these shores, and the TV ads for the car weren't all that interesting. But this Spanish-language ad really shows how mean the car really was. It growls! Slinky babes can't resist a man in an XR4- this ad is the proof!