Paul’s professional career began with drag racing in 1969 when he attended his first NHRA national event, in the following ten years he held records in B/MP, D/G and drove in the Pro Stock category for two years.
He began road racing in the IMSA American Challenge in 1981 with Dodge and won the GTS class at the 1992 12 Hours of Sebring. He earned nine IMSA /Grand-Am victories, eight poles and won the 1992-93 IMSA GTS Manufacturers’ Championship with Oldsmobile. He teamed up with Scott Pruett and Butch Leitzinger to win the overall 1994 Rolex 24 at Daytona in a Nissan 300ZX. He, Scott Pruett and Brian Simo won the GTS class at the 2002 Rolex 24 at Daytona 24-hour event in a Jaguar.
Gentilozzi won five Trans-Am drivers titles: 1998, 1999, 2001, 2004 and 2006, and ranked first in each Trans-Am performance category, including prize money, 31 victories, top three podiums, top-five and top-ten finishes, race starts, laps led, fastest race laps, lead-lap finishes and total wins. He was the only driver to win championships in three different marques: 1998 – Chevrolet; 1999 – Ford Mustang; 2001, 2004 and 2006, Jaguar.
Gentilozzi retired from driving in 2010. As Managing Partner, Gentilozzi formed 3GT Racing with longtime partners Tony and John Gentilozzi, in late 2015, to race the Lexus RC F GT3.