Sorry man, you can't win that one. They will have too many arguments up their sleeves. If you built two motors equally, one 4 and one 8, the bigger one would win. The only way 4 cyls win against v8s is because they have just worked harder on their motors. If the v8 had the same amount of work put into it, the poor little 4 cyls wouldn't have a chance. I own both types of cars, and the stock Corvette would stomp both my Civic and GSR.
Guys, you can't use a Mustang as an example... they suck! The old ones are cool, but the technology is outdated.