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Just wondering what is the max boost you or anyone else has safely run with the Whipple HO intercooled kit. Their website says up to 20 psi is "obtainable"...Has anybody ever actually done this? What does it take to do it? Overdrive crank pully plus small pulley on blower? I am only seeing 13 max....I am having GI JOE send me a smaller blower pully but I still don't see that making a 6 psi difference. Any and all input would be appreciated. Thanks In advance for your replies.
 

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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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