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The Cobra R that I assume you talk of, from 2000, had a 5.4 DOHC engine, making close to 400hp, all motor. It was, as the '96 - '99 Cobra before it, using a DOHC version of the mod motor. This one, though, used a 5.4 block instead of the 4.6 had a higher compression, and a much better intake manifold and heads, to name a few things. Thus the big power jump. But, it was a DOHC motor, not SOHC, and made closer to 400hp (385 rated), not 300. It was, at the time, the fastest factory Mustang ever made. Then, with the release of the '03 Supercharged 4.6, it took the top spot.Driftster.....The SVT cobra R had a 5.4L SOHC Iron Blocked Aluminum headed N/A engine making 300HP
Hilg