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document.write("<h5>Jaguar XF SV8</h5>");
document.write("Please do not confuse the effect of the turbo charger vs supercharger. Due to the free running nature of the turbo its does help a lot at altitude (spins higher due to the rarified atmosphere therefor compensating somewhat for the power loss.) This does not happen with a supercharger that is driven (at a fixed ratio) by the engine - therefor the same power loss will be experienced by supercharged cars vs normally aspirated cars.. Theo");
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