OK I can talk trash on both sides becasue I have both cars, I was driving my cobra racing my friends 02 Z06. I had a 2.9 pulley, a k and n drop in filter and flowmaster 2.5 mufflers and 1000 miles on the clock. The Z had longtube headers, x-pipe,no cats, vararam filter and compuer tuning. I will tell you the trap speed were damn close but I made the cobra work that day.
Click below for video
http://www.ls1forums.com/videos/lesvs03cobra.mpg
Click below for video
http://www.ls1forums.com/videos/lesvs03cobra.mpg