New AD AutoParts High Performance Ignition Coil Pack For Chevrolet Pontiac Saturn UF391 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