Here's a tune-up kit that just can't be beat! All top of the line tune-up parts, along with a set of Autolite Spark Plugs! The best in town. Buy the best and do it once! SMP HD products and Autolite sparklers. Can't get any better than that! Save some bucks buying it in kit form. This kit is for 4 cylinder engines. Six cylinder kits slightly higher.