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The complete exhaust system, except for new high-flow cats, is carryover on the '13 GT500. Even after years of dynoing 800-plus-horsepower 5.4s with these cast-iron manifolds, we can't believe how much power they support, and they're sure to do a good job on the 5.8. Of course, they are big contributors to the 5.8's sobering 623-pound shipping weight. Heavy as that is--nearly 200 pounds more than a Coyote 5.0--it's but one pound more than the out-going 5.4.