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the 140AX compressor is good to about 25PSI, but goes out of its efficiency range at about 23PSI.

we have a custom lower pulley on our shop car (07 GT) with a 2.75 upperwhich should normally be about 21PSI or so, but since we're running ported heads, 5.0L stroker, and longtubes, it loses boost because its more efficient, so we're seeing about 16.5-17PSI.
 
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