Great GT3 vs Viper vid

[Proshop]

Sorry if its a repost. It always gets me itching to find a track..
[media]http://www.youtube.com/watch?v=h4xQ3bfGP5s&feature=player_embedded[/media]

 

[ViperStaring]

Whoa. What an exhilarating 10-minute that was! Thank you so much.

 

[ViperStaring]

Right before the end in the 9th minute, the Viper seemed to be catching up to the Porsche finally and running alongside it for a long straight stretch. Then the Porsche overtook the Viper again. What happened?