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MUST OPEN LINK AND READ INSTALLATION INSTRUCTION BEFORE PURCHASING THIS PRODUCT. https://gmcidiotsguide.com/products. KIT USES PETRONIX IGNITION-PROVEN TECHNOLOGY. DELIVERS TWICE THE VOLTAGE TO SPARK PLUGS, INCREASES FUEL ECONOMY,AND SPARK PLUG LIFE. NO MOVING PARTS TO WEAR OUT.STABLE TIMING NO NEED FOR ANY ADJUSTMENTS. KIT COMES WITH DETAILED WRITTEN INSTRUCTIONS AND PHOTOS AVAILABLE.SAME KIT FOR 4K AND 6K ONAN. 30 MONTH LIMITED WARRANTEE.GM28-BOIGNKIT CAUTION STANDARD PETRONIX UNIT WILL NOT WORK THIS UNIT HAS BEEN HIGHLY MODIFIED.