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I have a Ford 392 Crate engine advertised at 430HP. Got it from RDI and they test/dyno each engine. Mine made 449.5 HP as opposed to the 430 advertised. This was done with open headers and finely tuned. This is probably the example you originally asked for. Big HP loss for these engines is the Ford aluminum heads. A good set of aftermarket heads will yield you 75 more HP. Some of the other guys are correct on the sidepipes. They will kill HP to the rear wheels
Hope this helps
Mark
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