Was this change in power due to any mod changes? Mine was building power all the way through to fuel cutoff. Then after installing the intake manifold, it doesn't, but i also did the pull with 91 instead of 93 and I have no Uprev tune yet (I have the software now!) I would look at the fuel you were using and weather changes.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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