I know Jon personally and he doesn't fudge numbers. They do dyno runs in 5th gear since that is the 1:1 ratio on our transmissions. A dual 2.5" exhaust has nothing to do with their numbers and wont make an impact to higher boost levels.
Were additives used in the fuel? maybe... and by additives I mean products like Boostane which don't get you much extra hp but rather help reduce knock and help keep your cylinder temps down.
Jon is a great tuner and I have seen a few of the AAM kits out of their shop and most of them are in the High 560+ and now with a 600whp at the same boost levels as the others make me think of "Semtex" car which I called a Wednesday build from the factory... His car on every dyno out paced same year with same mods by 15 to 20+ whp on an NA motor!!!
The owner of this car has what I call a Wednesday car!
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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054
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