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There are four oxygen sensors on Coyote-powered Mustangs. When installing long-tubes, wiring harnesses for the sensors technically must be extended by about 12 inches. However, while extensions are supplied, we discovered it's easier (and OK) to simply dislodge the stock harness from its clip on the transmission and attach the factory wiring to the frontmost oxygen sensors. Sensors for the X-shaped crossover tube do need the extensions.