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.