Originally Posted by r2r
^ That's not how things work!
Comparing top of the line Porsche (ex: Carrera GT) is not the same thing as comparing top of the line Chevy (ex: Corvette Z06)
American sports cars don't reach Ferrari or Porsche levels simply because few people would pay as much as they would for an Enzo or a Carrera GT.
BTW, I wonder what the wheel hp of the stock M6 is if it only does 480 with modification!
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With a very conservative guess at 15% loss from crank (507) to rear wheel horsepower, probably about 425 or 420.