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#12: 09-07-2012, 04:09 PM
 Spec B
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Title: JDM tuner wanna be
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Location: Central NJ
Car: 2011 Lexus ISF
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Assuming a good tune, no boost leaks and healthy engine...the comp ratio is the most likely cause.

Same engine with the same turbo running the same boost, fuel afr and timing will yield similar results. The other tune pieces (like Avcs) will not account for much difference in hp.