Fastest I've been is in my buddy's '98 Z28. I stopped at 155 (not my car)...he took it up to 165 (just before the limiter at 167). Not as stable as you'd like, but still fun.
BTW, I'm IN my delinquent teenage years (for another 6 months).
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Chris
[email protected]
1969 Firebird Convertible
455 with some goodies...
http://community.webshots.com/album/306838163rmehob