The only "prototype" Enzo sold to the public is for sale...
"The prototype uses an extended 348 body and a chassis built from that car, the F355 and the F430. All of this was to accommodate the Enzo's hulking V12 engine, which in this guise put out a staggering 670 horsepower."
Found Here: Jalopnik
Buy It Here: Modena Motorcport