Zach, I know, I'm jealous! I saw one on Pacific Coast Highway a few months ago. But it was rush hour, lots of traffic, and it was being driven by a 60-year-old guy who was on his cell phone. (Nothing against 60-year-old guys on cell phones, just that they aren't likely to race, traffic or not.)
I'm not surprised that the 911 TT takes the Viper off the line, nor that the Viper reels the 911 TT in. Something about 450 hp and 490 ft-lbs that's hard to overcome once in motion....