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A USA spec 964 3.6 motor is rated at 247 bhp (SAE) or 250 bhp (DIN). A 964 RS America is rated by Porsche at exactly the same specification. A Euro spec 964 RS is rated at 260 bhp(DIN). This 10 bhp extra came from somewhere, most likely a DME upgrade plus some blueprinting work from the factory. Various independent dyno tests have indicated that the difference in power between the two is even higher than quoted by the factory.
The European RS also came with an ultra low and ultra stiff suspension plus the best 4 piston calipers and discs the factory had at the time (unlike the RSA). Not 100% sure but the Euro 964 RS also had an lsd as standard.
Whether or not an RSA can be called a real RS or not is debateable but it is definetely a big step down from a Euro spec 964 RS which now commands a very significant premium in Europe over a plain 964 of the same vintage.
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