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Getting the fly-by-wire electronic 90mm throttle body that comes with the newer LS engines to function in your hot rod is not as tough as you may think. However, if you're old-school and like the idea of running a cable, you're in luck since many companies are now making 90mm throttle bodies. In addition to Holley, high-flowing throttle bodies are offered by FAST and Turn Key Engine Supply. Best of all, they bolt right up to your factory intake just as well as the aftermarket ones and if you need to suck in more atmosphere they even come in larger sizes.