XSTSR and SUPRS Announce Dates of Co-Sanctioned Online Sim Supermodified Challenge March 28, 2015 – Goshen, IN…Xtreme Short Track Sim Racing, (XSTSR), and the Supermodified Ultimate Pavement Racing Series, (SUPRS), have released the dates of the races that they will co-sanction in the newly named Xtreme SUPRS Challenge Championship. This …
Real supermodified race winners from across the country:
10/15-ISMA; Thompson Speedway Motorsports Park ; World Series of Speedway Racing: Dave Shullick, Jr.
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