In 1990 Porsche attempted to race a new car with carbon-fiber chassis, but CART banned it. The team expanded to two cars, fielding Fabi in the #4 Foster's/Quaker State March 90P-Porsche and John Andretti in the #41 Foster's March 90P-Porsche. Fabi would qualify on the pole position at the Texaco/Havoline Grand Prix of Denver at the Streets of Denver and would finish 3rd at the Marlboro Grand Prix at the Meadowlands at the Meadowlands Sports Complex but would drop to 14th in points. While Andretti would get a best finish of 5th at the Budweiser Grand Prix of Cleveland at Burke Lakefront Airport and at the Molson Indy Vancouver at the Streets of Vancouver and would finish tenth in points.