You are correct that they are different superchargers. However, you can upgrade the 6lb supercharger with a 9lb pulley. Thats what i did on my 93 and it works better. I wouldn't recomend going any higher the 9lb on the 6lb supercharger kit, the bearings aren't strong enough to take much more. 9lbs will be safe, but you should probably get a by-pass kit with that couple extra pounds of boost.
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94 Mustang GT
93 Mustang, LX, convertable, red, supercharged powerdyne 9lbs, aod w/ shift kit, 3.55s, performer manifold, ford motorsports shorty headers, flowmasters, eibach sport springs, chrome cobra rims
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