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Seen here are the famous Hi-Po cast-iron exhaust manifolds that Ford used on the Mustang. The Mustang manifolds differ from the earlier Fairlane manifolds due to the fact that the Mustang had a manual choke and didn't use a heat-riser tube off of the manifold. While cast-iron, they did flow much better than the stock 289 manifolds. Also note the chrome valve covers Ford used on the Hi-Po engine.