Sports car career
In 1998, Maassen moved to the FIA GT Championship, where he raced a Porsche 911 GT2 for Roock Racing, along with Bruno Eichmann. In 1999, he competed in Porsche Supercup. He also drove for Alex Job Racing at Petit Le Mans, where he won the GT class with Cort Wagner and Dirk Müller.
2002
Maassen started 2002 by finishing 4th at the 24 Hours of Daytona for Champion Racing. Maassen and Luhr dominated the GT class of the ALMS, winning seven of ten races en route to the championship. These victories included second straight Sebring win, and 3rd career Petit Le Mans win.
2004 & 2005
In 2004, Maassen acted mainly as a third driver for the longer endurance races, winning at Sebring and Petit Le Mans for Alex Job, and winning the GT class at Le Mans with Petersen Motorsports. 2005 saw him focus mainly on the development of the new Porsche RS Spyder, including racing in the car's debut at Laguna Seca.
2006
In 2006, Maassen would race the RS Spyder and win the LMP2 championship with Lucas Luhr. Maassen and Luhr would drive together for the first six races of the season, including one win (at Miller Motorsports Park) and an overall 2nd place (at Mid-Ohio). Maassen the partnered with Timo Bernhard for the remainder of the season, collecting two wins.
2007
Maassen continued driving for Penske in the ALMS
2008
Maassen continued driving for Penske in the ALMS, and competed in the 2008 edition of 24 hour Le Mans with Team Essex where he finished second in the LMP2 class together with John Nielsen and Casper Elgaard.
24 Hours of Le Mans results
The RS Spyder is a racing car designed by Porsche in conjunction with Penske to compete in Le Mans Prototype Class 2 (LMP2) racing. The car takes its name from the legendary Porsche 550 Spyder of the 1950s. The car marked Porsche's first return to the top level of sports prototype racing since the firm abandoned its Porsche LMP in 1999.
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Skea Racing International
Johnny Mowlem 
David Murry 
Didier de Radiguès 
Hideshi Matsuda 
Freisinger Motorsport 
Romain Dumas 
Team Essex