We might see factory stage tunes like they had with the Cobalt SS/HHR/Regal GS. I wouldn't expect more than about 300hp/340tq from a GM tune, but it will maintain your factory warranty. An aftermarket tune is probably good for more like 325hp/350tq or so, but it will void your warranty.
Of course there is far more to do than just a tune/intake, but the factory options are nice.
So far, we've seen aftermarket tunes add 20-25whp to the LT-1 Stingray, which would be about 25-30hp at the crank.
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