Video: K-Mag and Grosjean share some NASCAR thunder!

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Haas' Kevin Magnussen and Romain Grosjean were in the hot seat on Thursday in Austin where the pair experienced some big-bore NASCAR thunder with their master, Tony Stewart.

Stewart, who co-owns with Gene Haas the Stewart-Haas Racing outfit, indulged in some hot laps around COTA with Magnussen and Grosjean onboard the Monster Energy NASCAR Cup Series' Mustang.

Once the crash course was completed, the Haas chargers took each other around for some thundering, blistering, smoke-filling fun.

Check out the footage: