Round 4 - Austin, Texas, USA: IMSA WeatherTech SportsCar Championship Advance Auto Parts SportsCar Showdown Circuit of The Americas, Austin, TX USA Thursday 4 May 2017 991, Porsche, Porsche 911 GT3 R, GTD, Parker Chase, Harry Gottsacker World Copyright: Jake Galstad LAT Images
IMSA WeatherTech SportsCar Championship
Advance Auto Parts SportsCar Showdown
Circuit of The Americas, Austin, TX USA
Thursday 4 May 2017
991, Porsche, Porsche 911 GT3 R, GTD, Parker Chase, Harry Gottsacker
World Copyright: Jake Galstad
LAT Images