I'm calling BS on 155, especially after hearing about the aerodynamics (or lack thereof) of the 5th gen. Bad aero and 300hp wont equal 155, I can see 135-140 maybe. I've been 155 in an almost bone-stock '99 Z28 M6 about 8 years ago, it probably would have made 160 if there was a bit more room (those pesky stop lights come up on you pretty quick at those speeds lol
). Doesnt really matter though, it'll be fun to drive whatever the top speed is.