Bossman; You're getting dyno'd in the wrong trans. gear...it say's 3rd.
that's a 2.04:1 ratio....not even close to a true 1:1.
4th gear is 1.41:1 vs. 1.27:1 for stick-shift Z's.
5th is 1:1 in both.....most tuner's do 4th because of the speed;as in a base w/3.357 diff,that's still just over 120mph.
That's what is throwing you a curve....i'll dig mine up with a 4th & 5th gear pull.
K&N drop in air filter's is only mod at this time.
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