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As was already mentioned, supercharging is run off a pulley on the engine, while turbocharging is run off exhaust gases. I think the main difference here is when you make that extra power. Supercharging provides you with immediate, off-the-line power, low-end grunt so to speak. Turbocharging kicks in a bit later, because it has to "spool up" first. It gives you more high-end power through higher RPMs, for things like rapid acceleration in passing maneuvers. This is one reason why I do not have a big disadvantage when I race rallycross. Despite driving a non-supercharged Isuzu VehiCross against much faster turbocharged Subaru WRX Sti's and the like, the tight and twisty tracks keep speeds down enough that they never get into boost, so it is all about handling, not outright speed, and therefore sort of becomes anybody's game. Now in a rally sprint like ERS in Starke with long straightaways on forest roads where people get up to 90 mph... now there they have quite an advantage.

Also, supercharging increases temps under the hood, but turbocharging does so even more. I have seen pictures of the metal on a turbocharger glowing orange like liquid magma. I have read that the Redline will have larger vents in the front for this reason, but saw a pic in one of the auto mags and it didn't really look like those opening on the front fascia got any larger, and in fact I thought they made the car look worse because they lacked the chrome strip there that dresses up the regular Skys there. But maybe they screwed up and it was a stock photo of an earlier prototype Sky and not really a Redline. The hood vents are a nice touch and look to be of the extraction type, in other words air moving over the hood effectively sucks out the warm air underneath, as opposed to vents designed to really channel and force air in there.
 
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