OK,
a.) thank you for using your turn signal.
b.) as already stated (and my father-in-law had a Bonneville SSEi, so I know it feels strong and can roast the tires), you did not stand a chance against a new GT (unless I was driving, since you said it was a 5-speed, and my left leg in a cast).
c.) Your speedometer goes to 140. I have never been in a modern car that could bury the stock speedometer. Sure, those older cars with 85MPH speedo's, yes, but not anything like the vehicle you are talking about. So your claim of having him until the top speed registered is a bit stretched. Add in the fact that GM has it limited in the computer to 128, and it confirms the fact that it is implausible. 128 in a large car is still fast. And dangerous at night where DEER can come across and KILL you.
d.) After that left, you were full on it. You climbed to 90 pretty nicely, but by the time you hit 90, his taillights were all but a distant memory. So if you beat him or were keeping up in non-video'ed portions, then, as was again already said, he was playing you. Ever watch "Pinks?"
You: 240HP and 280 lb-ft.
Him: 325HP and 315 lb-ft.
Again, he played you or he cannot hold the pedal to the floor.