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Our eBay Store About Us Contact Us Add to Favorite Sellers Holley EFI 558-121 Terminator Stealth 2x4 MAIN HARNESS Introducing 2x4 Terminator Stealth EFI upgrade components. The wait is over. These upgrade components allow you to use your current Terminator Stealth EFI throttle body, install a new main harness, and slave throttle body, and you are finished. This upgrade is also perfect for anyone wanting to convert their 2x4 supercharged combo over to Electronic Fuel Injection!; General Policies ...

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