I had my old Cougar up to 135 on I-55 out in the middle of bumble**** Illinois once. It wasn't topped yet, but I ran out of balls and backed down.
I did have the pleasure of driving once in Montana before they reinstated the speed limit. I was in my Monte Carlo for that one, and it really didn't want to do much over 105. However, legally passing a cop while doing 105 was really cool.
