What spark plug to buy can be difficult to understand, especially with so many different models available. This is why you need to reference the NGK spark plug chart. This comprehensive guide allows users to match spark plugs with specific engine types, performance needs, and driving conditions. At Smart Parts Exports, we help U.S. customers use the NGK spark plug chart to: https://www.smartpartsexports.com/brands/aftermarkets-brands/ngk-spare-parts