BMR Fabrication - 1979-2003 Mustang - Bolt-in Driveshaft Safety Loop Most tracks require a driveshaft safety loop for cars running 12.99 or quicker. This NHRA approved loop is contoured to the Mustang floorpan for maximum exhaust clearance. May be bolted or welded directly to the floorpan. Available in Black Hammertone or red powdercoat.