Originally Posted by DirtyD
A slightly revised tune on the 2013 gave them a smoother low end TQ curve, and also they "gained" 8 crank HP, but no one is sure where that was accomplished at (squirters or tune revision)
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LOL, the
slight bump in power was due to the loss of windage and not a tune revision.
The 13+'s do also have the smaller head bolts which doesn't really effect power. There have been a few reports here and there about a head lifting under big boost applications but those are few and far between.
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