Sep 6, 2013, 1:15 PM EDT
The Pirelli World Challenge races from Sonoma Raceway will air this Sunday, September 8, on NBCSN at 3:30 p.m. ET.
Round 13 of the GT and GTS seasons, and Rounds 11/12 of Touring Car and Touring Car B-Spec were heavily action-packed. The results from the races set up very tight championship battles heading into the final weekend of the year in Houston, from Oct. 4-6.
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