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Old 06-05-2013, 09:57 PM   #2
hognutz


 
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Drives: 2013 ZL1
Join Date: Oct 2011
Location: tangent or
Posts: 2,656
2.55 upper is 13psi. proabably ~550-560whp.

most people don't do just the upper alone. some people have done just the lower 10% pulley which was 540-550whp. that is 10.5psi or so

my .02 if your pulling the snout to do the upper port it and throw a TB on at the same time.

then when you get done with all your mods you will be in the 600-625 range you will need injectors too at that point as you will be out of duty cycle.
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