Remember, the RX8 is already 3050 pounds. Thus, even with the 160-180 LBS loss you theorize, that would mean a curb weight of 2890 at least using your numbers. I agree the 2650 may be farfetched, but 2800-2900 is definately attainable. BTW - Mazda plans to use a new, lighter chasis for any new 7; so yes, it would be potentially even lighter.
And, I think there will still be options to lower weight (wheels, battery, etc). HOWEVER, Crash, I think where they will not be much room for improvement is with tuning. I bet any gains, aside from going FI, will be minimal.
That said, if the 370z can hang with a Cayman S (a little more weight than RX7 and much more HP) on a track/in the twisties, I would think it should be able to best this new RX7 on the track. Advantage RX7 in twisties, Advantage Z on full track runs.
Again, we will see come mid to late 2011.....
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