Yes, for '04 it finally looks like the supercharger is a little more worth having. The horsepower is up to 260 now, and premium fuel is no longer required, even though it is recommended. From what I've gathered, GM is using almost a totally different Eaton model of supercharger, which is obviously more efficient.
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Adam Smittkamp
ACS Automotive Service, Inc.
*Your ACDelco Headquarters*