Having attended both F1 and IMSA races, I found some distinct differences, and you might be surprised at what I discovered.

First introduced to the WeatherTech GTP class, GTD Pro and GTD will sport similar hardware at the Rolex 24 making it easier to mandate and adjust performance.

IMSA Photo Matt Kurdock, IMSA technical director, has been on the BOP case for nearly a decade. This year, the series is changing up things bit in its GTD and GTD Pro classes when it comes to BOP ...

However, with no sign of the team on the entry list, it is likely that Ligier may have seen its final year within IMSA. The GTD Pro class stays pretty much the same as what we saw last year ...

IMSA president John Doonan says that GTP manufacturers ... is contracted to Corvette Racing and the GTD Pro category. The most talked about young American in sports car racing, teenager Josh ...

This is the marquee class in IMSA’s WeatherTech Championship Series ... Mercedes-AMG and Porsche. GTD’s Pro class generally sees more manufacturer support and driver lineups consisting ...