I've managed to hit 135 in mine on two occasion. The first time was traveling with a 2.5RS on 95S and the second was racing a 300ZX. I got a look at the Z's motor and apparently is was built...I don't see how though, he didn't gain on me at all, in fact I started to gain on him before we had to shut down (I-90 east). I think I passed the state police barrics at like 120...woops.
Oh, I'm bone stock.