Coil Pro Power Series GM LS Truck Style Red 8-Pack 1999-2007 GM Trucks 4.8/5.3/6.0L 2003-2007 Hummer 6.0L Vin Z/N/T/V/U/B/P (8Th Digit) MSD IgnitionConnector and Plug Wire are on Opposite Ends. MSD's engineering team has been working diligently the past year to improve our Multiple Spark Coils for the GM LS engine platform. The coils fit in place of the OEM coils yet are capable of delivering higher spark energy to the plugs, topped with multiple sparks at idle rpm. Increased spark energy and voltage, along with multiple spark capabilities, help improve the combustion process of the fuel mixture