Mowlem joined Corsa Motorsports for the 2008 ALMS season, racing a Ferrari in the GT2 class. Late in the season, the team started a new venture in conjunction with Zytek. Mowlem's continuing association with the Zytek team resulted in a joint effort to race a hybrid-powered car in the P1 class in ALMS. The Ginetta-Zytek GZ09HS hybrid car debuted in 2009. The car, was powered by a hybrid power plant. It combined an internal combustion engine and an electric motor. The effort made history when Mowlem qualified the car third and finished third in the P1 class in a race at Lime Rock Park. Mowlem did much of the test driving during the extensive development process conducted by Zytek.