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Turn the blower upside down and its discharge port is visible. KB offers its 2.8-liter blower in standard or high-pressure (2.8H) configurations. The difference is the high-pressure blower has a higher internal compression ratio and is more efficient at higher boost levels, starting at 15 psi. From 8 to 12 pounds of boost, the standard 2.8 is definitely the better choice; up in the 18-psi range, the 2.8H could free up an additional 50 hp or so.