Kammala wannan jumla: Fabi ya dawo tare da Porsche Motorsports a 1990 don fitar da lambar 4 Foster's-Quaker State Maris 90P-Porsche Indy V8. Kafin farawar kakar, Porsche zai gina shasi na carbon fiber tare da mai tsara su, Injiniyan Maris. A watan Janairu, masu fafatawa na Porsche sun yi adawa da amfani da motar kuma sakamakon haka Porsche ya yi amfani da motar 89P mai shekara ta Maris. Fabi ya cancanci na bakwai a Toyota Grand Prix na Long Beach a ranar amma ya gama na goma. An yi amfani da sabon Maris 90P a
Indianapolis 500 da Fabi sun fara ashirin da uku kuma sun yi ritaya a goma sha takwas saboda matsalolin watsawa bayan zagaye 162. Daga baya Fabi ya cancanci matsayi na farko don &lt;a href="Grand%20Prix%20of%20Denver"&gt;Texaco/Havoline Grand Prix na Denver&lt;/a&gt;.Ya jagoranci zagaye daya amma ya fadi bayan zagaye bakwai kuma ya gama na ashirin da bakwai. Fabi ya sami kyakkyawan sakamako na uku, a Marlboro Grand Prix a Meadowlands, a Meadowlands Sports Complex, kuma ya ƙare kakar wasa ta goma sha huɗu a maki. A ƙarshen kakar, Porsche ya janye daga tseren motocin Indy don haka Fabi ya koma Gasar Wasanni ta Duniya a 1991 kuma ya lashe gasar.