Set of 1 AD Auto Parts Ignition Coil B149 + 1 Bosch Spark Plug 4301 For Lexus & Toyota V6-3.0L Helps ensure proper engine performance, maximize fuel economy, minimize both tailpipe emissions and RFI electronic interference Coil Housing Engineered to withstand extremes in temperature without cracking Radio-Frequency Interference (RFI) Suppression minimizes electronic noise Helps avoid spark plug failure, drivability complaints, pre-ignition and detonation Insulation Multiple coats on the primary and secondary windings to ensure no internal arcing