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When the MSD draws current, it will draw through the Noise Filter instead of directly from the battery, so all other accessories that operate off 12 volts, like the radio, fuel pump, or the engine computer, will be unaffected by the MSD.The Noise Filter will also prevent damage to the MSD during jump-starts and will keep a vehicle's 12-volt line \"clean\" by removing any voltage and current surges that could interfere with the operation of some MSD accessories such as the Soft Touch Rev Control or the Two Step Module Selector. 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The harness with USCAR\/Stock injector connectors will cover most applications that are using the factory injectors. The other harness is for the Bosch and Holley (or Jetronic\/Minitimer) injector connector that is commonly used in aftermarket applications for larger injectors. View the image gallery to see images of both types of injectors.","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":45732456759382,"sku":"GVMR_558-210","price":208.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/8017\/0326\/files\/558-210.jpg?v=1789064547"},{"product_id":"holley-efi-ford-2v-and-4v-modular-main-harness","title":"Holley EFI - Ford 2V and 4V Modular Main Harness","description":"Main harness for 99-04 2 \u0026amp; 4 Valve Ford Modular (4.6 \u0026amp; 5.4L) Engines.","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":45732457054294,"sku":"GVMR_558-108","price":913.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/8017\/0326\/files\/558-108_01.png?v=1789064567"},{"product_id":"holley-efi-gen-iii-hemi-main-harness-late-w-tps-and-idle-air-control-connections","title":"Holley EFI - Gen III HEMI Main Harness Late w\/ TPS and Idle Air Control Connections","description":"Gen III HEMI Harness with TPS and Idle Air Control Connections. 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