The HKS M-Series Super Fire Racing Spark Plug has been developed to provide your vehicle with smooth acceleration, and improved performance throughout the entire RPM Range. These spark plugs are a #9 heat range, and are an ideal spark plug for those with mild to extensive bolt-ons. With iridium technology, the HKS M-Series Super Fire Racing Spark Plugs will provide enough spark energy and performance for spirited driving, or the occasional track weekend. If it?s time to maintain your vehicle with a refreshed tune, you should include the HKS M-Series Super Fire Racing Spark Plug to make sure your car is running at optimal levels. Sold as a set of 4 spark plugs Tested on our 2019 JSN Hyundai Veloster N
