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HP gains from 2.3 upper pulley and Big Gulp
Has anyone tried just a couple mods like this and what gains did you get? I am thinking of doing the 2.3 upper and a Big Gulp. Eventually I would have ,y blower ported 103mm TB as well, but not this year. No headers yet but I do have an axle back exhaust.
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1980 Z28 AWSM-Z
1993 Z28 AWSM-Z
2014 2SS AWSM-SS
2018 ZL1 AWSM-Z
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