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The GM plug-and-play wiring harness for the LSX376 crate motor includes the mass air sensor and fly-by-wire throttle control. The kit requires that you fabricate the inlet tube out of 3.5-inch tubing so that the mass air meter fits and is correctly calibrated to the programming. "We bought a bunch of elbows and curves and cut them up to fit nicely," says Brewer. "We tacked them up, then welded them once we liked the fit."