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Al reports the engine has been a rock ever since he's had the car running. "The only real problem with squeezing in the 5.4, which is 2.5 inches wider than a 4.6, is that the valve covers can't be removed with the engine in the car," he says. His goal with the intake was to make it look factory, which it indeed does. Al also had to modify the factory Cobra fuel rails by cutting off the stock brackets and making new ones in order for them to work.