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The 2011 Porsche 911 (Type 997) GT3 RS comes with a 3.8l 450hp flat 6. It is based off of the GT1 block that originate from the 1998 Porsche 911 GT1.
4.7 seconds
The 911 GT1 was the fastest. However, it wasn't a "true" 911, the only thing it really shared with other models was the name. Considering that, the fastest proper production 911 is the GT2 RS.
fast
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slow
The speed of a 911 turbo is roughly 202mph (325 kmph)
It is correct to say that Ferrari Enzo FXX is a GT1 Class Car.
600 GT1's in total, of which 100 are Z06's
F1 car has more power and it is lighter than GT1 car
they go quite fast and therefore are the cause of a ton of accidents