Aside from the 87 octane problem, I hear there is quite a bit of difference between the L99 (auto) and LS3 (manual). The L99 is no slouch, but in its stock form, it is a little sluggish. One problem, IMO, is the gears are only 3.27 or something. That, and the stock tune sucks, and there is TQ management and cylinder deactivation. A good tune makes a world of difference, and switching to the 3.70 gears was awesome.
One other thing I noticed is that you don't feel like you're going fast in these cars, but you really are. Doing 60 mph on the freeway feels more like 45.
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