Denso U-Groove Traditional Spark Plug Stock Heat Range 3381 Subaru WRX 2006-2014 / STI 2004+

Part #: DEN K20HR-U11. This amazing Denso 3381 Spark Plug features Denso's patented U-shaped ground electrode. The U-Groove creates a channel for the spark nucleus at ignition, producing a stronger spark. It's crucial to check your spark plugs for wear during regular service. New spark plugs guarantee a well - running engine, better fuel economy, and improved response. These are the factory - spec heat range spark plugs that fit your vehicle perfectly. They are sold individually.

Using this Denso spark plug is easy. Just replace your old spark plug with this new one in your Subaru WRX (2006 - 2014) or STI (2004+). Make sure to tighten it properly but don't over - tighten. When it comes to maintenance, check the spark plugs regularly during service intervals. Look for signs of wear like erosion or carbon buildup. If you notice any issues, it's a good idea to replace them. New spark plugs will keep your engine running smoothly, save you on fuel, and give your car better response. Always store the spark plugs in a dry place to avoid any damage.