In 1995, Borkowski ran a limited schedule in
Indy Lights with Team Medlin, competing and finishing in the top ten in all six races run with a best finish of fourth at
Belle Isle Park in Detroit. In 1996, Borkowski was tapped to run his first
24 Hours of Daytona as factory driver for the #1 Oldsmobile Aurora GTS-1 alongside drivers
Irv Hoerr, Brian Cunningham, and
Darin Brassfield. The team was leading in class when the car caught fire at the 9 hour mark, preventing the car and team from finishing the race. In 1996, Borkowski was also selected for the inaugural Team Green Academy, however, was unable to participate due to being signed by
Team Rahal Letterman. 1997 was a breakout year for Borkowski's professional career, competing for
Team Rahal Letterman in partnership with
Tom Gloy Racing in the
Trans-Am Series, collecting the two aforementioned wins, third in the overall championship, and Rookie of the Year honors. In 1998, Borkowski returned to
Indy Lights under the
Team Rahal Letterman banner but with limited success, collecting only one top five finish at
Vancouver in fourteen starts. In 1998, Borkowski also ran his second
24 Hours of Daytona, campaigning a
Tom Gloy fielded GT1
Ford Mustang Cobra alongside drivers
Tony Kanaan and
Robbie Buhl, finishing third in class. In 1999, Borkowski qualified and raced in one
Indy Racing League event at the
Charlotte Motor Speedway, however the race was stopped prior to completion after crash debris entered the grandstands killing three spectators. Borkowski also made his one and only attempt at qualifying for the
Indy 500 driving for
PDM Racing but never got his chance when rain cut short qualifying on Bubble Day. Later in his career, Borkowski returned full-time to driving sports GT and prototype race cars in the
Rolex Sports Car Series. In 2003, he was hired by legendary
Brumos Racing to campaign a
Porsche powered
Daytona Prototype alongside
David Donohue in the inaugural season for the
Rolex Series and
Daytona Prototype class. Together Borkowski and Donohue won three races, stood on the podium ten times, and finished second overall in the series championship. Between 2003 and 2010, Borkowski competed in both the Rolex Series'
Daytona Prototype and GT classes for various teams including Speedsource,
Michael Shank Racing, Playboy Racing, and Stevenson Motorsports. During this period he drove a variety of cars with a variety of co-drivers including
Daytona Prototype's (with
Paul Tracy, Kenny Wilden, and Brian Friselle), a
Nissan 350Z and
BMW M6 (with Tommy Constantine), and a
Chevrolet Camaro GT.R (with
Matt Bell). In 2004, Borkowski also piloted a Lola Nissan LMP2 prototype in the
12 Hours of Sebring with co-drivers Ian James and John Macaluso, winning their class. ==NASCAR==