| The ATI setup seems much easier to install, less intrusive, etc. It's a centrifugal supercharger, while the Stillen setup looks to be a positive displacement type supercharger. But there are drawbacks to the centrifugal type, as you'll see on this page: [ http://www.gadgetonline.com/Super.htm ] I'll copy and paste the important part: "The centrifugal superchargers use the same type of compressor impeller as a turbocharger and the faster they spin the more boost they make and it is not linier. If you double the speed of the compressor you quadruple the output. The problem is that they only make peak boost at the engine's redline and tend to make very little boost at lower engine speeds where they are mostly operated...The positive displacement supercharger will move a fixed amount of air on each rotation and that is not dependant on impeller speed as it is on the centrifugal type. When a positive displacement supercharger's size is properly matched to an engine and it turned at fixed ratio to engine speed it will produce a set amount of boost throughout almost the entire RPM band, from just off idle to full RPM." So the Stillen is more intrusive, but probably gives a much better powerband.
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