Autolite HT0 spark plugs are one heat range colder then stock on 2005-2008 Ford Mustang GT's! These highly recommended on Nitrous, Supercharged, and Turbo applications! Please note Ford has redesigned the cylinder heads in 2008, and this spark plug is not compatible with the new design Price is for EACH spark plug PWH-FRM-HT0$12.96 www.realspeedauto.com Ph.631-563-7325 All parts listed are for the Ford Mustang unless otherwise noted. Copyright 2018 Realspeed Automotive Inc. All rights reserved.