NASCAR and IMSA sports-car racing. They each won five. In earlier years, Porsche dominated the Rolex with racing versions of its famed street car — the 911. Last year, a Porsche-backed prototype ...

Penske also returned to IMSA in 2017 with Acura and later switched to lead Porsche's GTP program, which won the 24 Hours of Daytona and the GTP championship last year. Like Brown and McLaren ...