American performance car by obvious reasons is the S7 , bit If you meant traditional american sports car (with OHV engines) the Viper is the BEST , just like the Shelby cobra was in the past years (60's) It wasn't the fastest , but It was the best; The viper is modern days shelby cobra and no one can reject that , The vette performs better than the Viper , but the viper is pure and unique , making it better than the fast vette.
Viper and tradition dont belong in the same sentence. Viper lovers wanna think its a modern day shelby cobra when it isint. the Z06 can be only a fast vette but all the viper fanboys loved to brag about how much faster the Viper was against previous generations of the corvette, now they are saying other things now that the Z06 is faster.
i cant belive you would call it the best <A BORDER="0" HREF="http://www.supercars.net/PitLane?displayFAQ=y"><IMG BORDER="0" SRC="pitlane/emoticons/tongue.gif"></A> vette for me, but the SSC or whatever impressed the hell out of me when i read an artical on it. still looks cheap and crapy, but aparently it doesnt drive that way.
This, http://www.exoticcarsite.com/gallery/view_photo.php?full=1&set_albumName=album420&id=Picture_756
But the Shelby 427 Cobra was the fastest. At least fastest accelerating way faster then the Corvettes. It was even quicker to 60 mph then the current viper at 3.5 seconds.
Here's what happens: Everyone flames you for making such a stupid, broad thread in which you compare cars that have nothing in common other than being American. Then they call you names and tell you how much the SSC Aero still sucks. Oh, and Panoz rules!