At the end of the 2007 season, Richard signed a factory contract deal with the German marque Porsche, and the British ace proceeded to take on the world's best on the other side of the Atlantic.

[1] Having been unable to secure the budget required to compete and advance his career, Westbrook was forced to take a lengthy six-year break from racing, before convincing a friend to loan him the money to buy a Porsche GT3 Cup Car for the 2002 season.

However, it was in the FIA GT Championship where he would achieve his biggest success, winning the GT2 class overall after victories at Silverstone (UK), Adria (Italy), Hungaroring (Hungary) and Zolder (Belgium) backed up by second places in Algarve (Portugal) and Paul Ricard (France), in a Porsche 911 GT3 RSR (997).

There were also outings for Westbrook in the Le Mans Series for Prospeed Competition, but it was his stand-out star performances in a Matech Ford GT1 during the final six rounds of the 2010 FIA GT1 World Championship that would turn heads, taking three podiums alongside Thomas Mutsch.

He also took part in the British GT Championship in 2010 (3 podiums, 1 pole position, 1 fastest lap), helping Trackspeed team owner/racer David Ashburn to the title that year.

Westbrook and his co-drivers Jan Magnussen and fellow Brit Oliver Gavin posted fourth-place finishes in 2011 in Sebring and Road Atlanta, and they were leading at Le Mans at the 16-hour mark when the car was involved in an accident and subsequently retired.

Also in 2012, he received a new challenge, a full-season in the Rolex Sports Car Series in Spirit of Daytona Racing's all new Corvette Coyote DP alongside Spaniard, Antonio García.

The 2013 season saw Westbrook take part in the final year of the Rolex Sports Car Series again with the Spirit of Daytona Racing team in the Corvette Coyote DP.

Contact by a GTD Audi at the season finale,[7] ended his hopes of becoming the Vice-Champion in the series, but he, Mike and Michael finished seventh at the flag to secure third.

The trio lost eight laps due to a slipped alternator belt and gearbox leak, but completed the race to take fourth in the GTE PRO category.

[8] Westbrook will join Chip Ganassi Racing for the full 2016 WeatherTech SportsCar Championship season driving the new Ford GT with Ryan Briscoe, Joey Hand and Dirk Müller.

In the same year, he also took part in the newly formed Blancpain Endurance Series in the final two races (Magny-Cours and Silverstone) for JR Motorsports in a Nissan GT-R GT3, and competed in the 24 Hours of Spa for Haribo Team Manthey in a Pro-AM Porsche 997 GT3-R. he also drove with his friend David Ashburn in the British GT Championship when available, almost helping Ashburn successfully defend his title, taking 2 wins, 3 podiums, 2 pole positions, and 2 fastest laps along the way.

At the end of 2011, Westbrook raced in Australia at the Armor All Gold Coast 600 in Queensland alongside local hero Todd Kelly in the Jack Daniel's Holden Commodore.

Namely British GT (Trackspeed with David Ashburn – 1 win, 2 podiums, 2 pole positions, 1 fastest lap), the Blancpain Endurance Series (Monza and Nurburgring) for the Haribo Racing Team.

[10] In 2014, Westbrook was scheduled to again compete in the Nurburgring 24 Hours with Haribo Team Manthey, but an opportunity arose to join an all PRO line-up with Nicki Thiim, Marco Seefried and Alex Müller in the no.9 Prosperia-Abt Audi R8 LMS Ultra GT3, a car he'd driven a few weeks prior in VLN 4.