O'Young then 25-year old competed in the Porsche Infineon Carrera Cup Asia driving for Jebsen & Co, the Hong Kong Porsche dealer team.

Darryl was also invited to join the Hong Kong Le Mans Team set up by Matthew Marsh in 2005.
The pair raced a Porsche 911 GT3 RSR in the Le Mans Endurance Series.

Darryl also took part in the 2005 FIA GT Championship - China Round race at the Zhuhai International Circuit, since the Hong Kong Le Mans Team entered the race as part of its 2005 programme.
The pair finished fourth in the GT2 class.

In 2006 Darryl joined Renauer Motorsport for the Spa 24 Hours race, successfully finishing the race with the team.

He has raced for Team Jebsen since 2004 and on 22 October 2006 became series champion of the Porsche Carrera Cup Asia after winning both races at the Zhuhai International Circuit.

For 2007, O'Young joined Schnabl Engineering - LKM - Team Jebsen to take part in the Porsche Mobil 1 Supercup.
He was the first Hong Kong driver to take part in the series.

In October and November, O'Young was back in Asia for Porsche Carrera Cup Asia, racing in Shanghai, Zhuhai and the Macau Grand Prix.
He won the Macau race despite finishing second on the road, as his opponent, Danny Watts violated the rule by overtaking him under a yellow flag caution period and was given a 30-second penalty.

For 2008, Darryl is competing in both Porsche Supercup and Porsche Carrera Cup Asia.
O'Young was crowned series champion after the final race at Bahrain International Circuit.
He has 196 points and 4 wins in the season.
He became the first-ever double Class A champion in the Porsche Carrera Cup Asia.

Darryl also competed in the Merdeka Millennium Endurance Race in Malaysia.
Driving for Porsche Club Singapore, he won the race with Mok Wing Sun and Alexander Nicholas Davison.
The trio completed 308 laps in 12 hours in their Porsche 997 RSR.

Darryl completed a motor racing hat-trick on 16 November 2008 when he took top honors at the Windsor Arch Macau GT Cup, driving a Porsche 997 GT3 Cup.
He beats Danny Watts by more than two seconds.
This was the third time he has won in a Porsche in Macau.

In 2009, Darryl announced that he would compete the entire 2009 FIA GT Championship season.
He drove in the GT2 category in a Porsche GT3 RSR partnered with Porsche Junior Driver, Marco Holzer, with Belgium-based Prospeed Competition, the official Porsche factory-supported team in the FIA GT championship.
In doing so, the 29-year-old was the first Chinese race driver to compete a full championship in the FIA GT.

In 2009, Darryl also competed in the Porsche Carrera Cup Asia for Team Jebsen, his 6th and final season for the team, where he finished 3rd overall in the championship standings at the end of the year.

In addition, in 2009, Darryl entered the 24 hours of Le Mans for the first time in his career driving a Porsche GT3 RSR.
The Chinese driver spearheaded the driver line up made up of Phillip Hesnault of France and Plamen Kralev of Bulgaria.
He drove for  the first ever Hong Kong team entry, Endurance Asia Team which was managed by Thierry Perrier.
The team was the first ever Hong Kong/Chinese team entry in the race's 77-year history.
The car broke down after 16 hours and was unclassified.

At the end of 2009, Darryl was invited for his first ARCA Stock Car Test on the Daytona International Speedway.
 He completed a successful test for Starbeast Motorsport while sharing a car that day with ex-Formula 1 driver, Narain Karthikeyan.

In 2010, Darryl entered the 24 hours of Daytona for the first time in his career driving a Porsche GT3 Cup for Vancouver-based, Bullet Racing managed by Steve Paquette.
 The driver line-up included Ross Bentley, Sean McIntosh, and ex-Porsche factory driver Kees Nierop.
 They ran as high as 3rd place in class and 14th overall near the 13th hour mark of the race, but an incident during the night after an off track excursion by one of the drivers ended all hopes of race victory for the team.
 They completed the race 20th overall and 13th in the GT class.

On 6 February 2011 O'Young drove for Audi Sport Team J
O'Young then 25-year old competed in the Porsche Infineon Carrera Cup Asia driving for Jebsen & Co, the Hong Kong Porsche dealer team.
Darryl was also invited to join the Hong Kong Le Mans Team set up by Matthew Marsh in 2005. The pair raced a Porsche 911 GT3 RSR in the Le Mans Endurance Series.
Darryl also took part in the 2005 FIA GT Championship - China Round race at the Zhuhai International Circuit, since the Hong Kong Le Mans Team entered the race as part of its 2005 programme. The pair finished fourth in the GT2 class.
In 2006 Darryl joined Renauer Motorsport for the Spa 24 Hours race, successfully finishing the race with the team.
He has raced for Team Jebsen since 2004 and on 22 October 2006 became series champion of the Porsche Carrera Cup Asia after winning both races at the Zhuhai International Circuit.
For 2007, O'Young joined Schnabl Engineering - LKM - Team Jebsen to take part in the Porsche Mobil 1 Supercup. He was the first Hong Kong driver to take part in the series. 
In October and November, O'Young was back in Asia for Porsche Carrera Cup Asia, racing in Shanghai, Zhuhai and the Macau Grand Prix. He won the Macau race despite finishing second on the road, as his opponent, Danny Watts violated the rule by overtaking him under a yellow flag caution period and was given a 30-second penalty.
For 2008, Darryl is competing in both Porsche Supercup and Porsche Carrera Cup Asia. O'Young was crowned series champion after the final race at Bahrain International Circuit. He has 196 points and 4 wins in the season. He became the first-ever double Class A champion in the Porsche Carrera Cup Asia.
Darryl also competed in the Merdeka Millennium Endurance Race in Malaysia. Driving for Porsche Club Singapore, he won the race with Mok Wing Sun and Alexander Nicholas Davison. The trio completed 308 laps in 12 hours in their Porsche 997 RSR.
Darryl completed a motor racing hat-trick on 16 November 2008 when he took top honors at the Windsor Arch Macau GT Cup, driving a Porsche 997 GT3 Cup. He beats Danny Watts by more than two seconds. This was the third time he has won in a Porsche in Macau.
In 2009, Darryl announced that he would compete the entire 2009 FIA GT Championship season. He drove in the GT2 category in a Porsche GT3 RSR partnered with Porsche Junior Driver, Marco Holzer, with Belgium-based Prospeed Competition, the official Porsche factory-supported team in the FIA GT championship. In doing so, the 29-year-old was the first Chinese race driver to compete a full championship in the FIA GT.
In 2009, Darryl also competed in the Porsche Carrera Cup Asia for Team Jebsen, his 6th and final season for the team, where he finished 3rd overall in the championship standings at the end of the year.
In addition, in 2009, Darryl entered the 24 hours of Le Mans for the first time in his career driving a Porsche GT3 RSR. The Chinese driver spearheaded the driver line up made up of Phillip Hesnault of France and Plamen Kralev of Bulgaria. He drove for  the first ever Hong Kong team entry, Endurance Asia Team which was managed by Thierry Perrier. The team was the first ever Hong Kong/Chinese team entry in the race's 77-year history. The car broke down after 16 hours and was unclassified.
At the end of 2009, Darryl was invited for his first ARCA Stock Car Test on the Daytona International Speedway.  He completed a successful test for Starbeast Motorsport while sharing a car that day with ex-Formula 1 driver, Narain Karthikeyan.
In 2010, Darryl entered the 24 hours of Daytona for the first time in his career driving a Porsche GT3 Cup for Vancouver-based, Bullet Racing managed by Steve Paquette.  The driver line-up included Ross Bentley, Sean McIntosh, and ex-Porsche factory driver Kees Nierop.  They ran as high as 3rd place in class and 14th overall near the 13th hour mark of the race, but an incident during the night after an off track excursion by one of the drivers ended all hopes of race victory for the team.  They completed the race 20th overall and 13th in the GT class.
On 6 February 2011 O'Young drove for Audi Sport Team J
Darryl O'Young