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Pretty much every supercharger kit at altitude will suffer a boost pressure loss due to the lower atmospheric pressure. If you want to run the 6-6.5psi that the kit is designed to run, you will likely need a pulley 7-8mm lower than what's provided. I'm not sure what your altitude is, but we are at 6,000' and 8mm is about right, maybe just a tad less than desired. Boost pressure will also be dependent of the exhaust back pressure, so keep that in mind as well. A catless car will make a little less boost, but more power as a result of better flow.
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