NRW Design S85 Billet Spark Plug Tubes BMW M5 M6 E60 E61 E63 E64

NRW Design Billet Spark Plug Tubes with Viton Gasket Set! Made from 6061 billet aluminum, these are the first ever serviceable spark plug tubes on the market. Giving 30% more contact surface than the OEM spark plug tubes. Our billet spark plug tubes will last a lifetime and will not leak, tear, or deteriorate over time.