This is the only McLaren I would ever want:
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Specialized teamed up with McLaren to come up with the lightest, most aerodynamic, and very stiff race bike frame. I think it's sub 900g. It's called the McLaren Venge.
Yeah, I know that one - it's the wallpaper on my computer at work. I do see some bicycle commuters in the city with S-Works Venges, but not the McLaren version though. Still, a Venge is a pretty exotic commuter ride!
I don't think the Venge is actually the lightest, but it is very aerodynamic. I did have a list of weights of various frames, but I've misplaced it.
Now, to get this back to real McLarens, the P1 has a massive rear wing:
http://jalopnik.com/5946531/mclaren-p1-every-gorgeous-angle
Ignore the silly journalist-speak, just look at it.
The front splitter on the final version will be longer than on this one, and it'll also have another air-vent on the front corner of the car (left and right side).
Edit 2: One Australian website was reporting some leaked performance details, 600kW from the V8 engine, with extra power from two flywheels spinning at 80,000rpm able to deliver extra power to push the total to 720kW. The article also suggested 0-62mph in 2.8sec, and 0-125mph in just 6.9 seconds, with the top speed in the region of 385km/h. The article also reiterated the claim that the car smashed the Silverstone road-car lap record by some 24 seconds. The same article mentioned the weight was 1225kg. That would give some 800hp per tonne, well eclipsing the old F1s 550hp/tonne figure, and even that of the F1 LM 640hp/tonne.
Another article mentioned the car had 1300lbs downforce at the front at a speed of 125mph.
Autoblog apparently got a walk-around of the actual car before the media day started at the Paris show. Its reporter mentioned the car is very small, much smaller than you expect. It's apparently a similar size to the original F1, which means similar to a Porsche 911. When the rear wing is deployed, various flaps underneath the car also open up.
