Originally Posted by Steve
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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Hey, that is the information that was discussed when the 13s came out and were starting to be analyzed. I never saw anything else to to combat that theory. I'm just posting what I've heard. It is has been shown the TQ curve is smoother through the low RPMs though. It would make sense that a slight decrease in rotational weight would let the motor produce more work over the same time.