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Exhaust ports on the Three-Valve heads are raised slightly higher than Two-Valve ports. Mating the Three-Valve engine’s exhaust ports with an ’96-’04 Mustang’s stock exhaust or aftermarket headers is done by installing Logan’s 1/2-inch-thick steel adapter plates. The plates feature angled faces, which help bring the Two-Valve exhaust collectors closer to the ‘Stang’s stock exhaust. The stock Two-Valve midpipe will require a slight adjustment in order to sync with the collectors.