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What you need to do is get a boost reading. Depending on the exhaust and throttle body you may be able to run the 2.8 without a problem. The other down side to a 2.8 is the heat in Arizona during summer.
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'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger
Authorized MagnaCharger Dealer/Distributor
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