The heat might kill a bit of et and MPH but not that much.
Stock tachs are also notorious for being off at higher RPM, you should get an aftermarket or programmed shift light.
I had almost exactly the same dyno numbers and ran 13.2 at 110mph at 3050lbs w/o driver. So I would think either you are shifting too early or it is not tuned since the install of the MAF.
Either that or the dyno was off!!
Hope you get it sorted out, it is all in the tuning at this point.
Mike
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1992 DECH GT
Not stock, still slow.
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