He's the voice of IndyCar on NBCSports - and one of the best racing minds today. Leigh Diffey joins us to talk NASCAR Roval, IndyCar, Alonso, F1 team rules and we even give a plug to David Hobbs (Hobbo!). 

<p>He's the voice of IndyCar on NBCSports - and one of the best racing minds today. Leigh Diffey joins us to talk NASCAR Roval, IndyCar, Alonso, F1 team rules and we even give a plug to David Hobbs (Hobbo!).&nbsp;</p>

You know that guy who loves to talk with you about cars and racing? That's Big Jim O'Brien - and you're always welcome to stop by his garage as he hats with some of the biggest names in racing:  Mario Andretti, Alexander Rossi, Roger Penske, Bob Seger, Kurt Busch and many more...

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