 Complete the following phrase:  Fabi returned to Indy car racing in 1988 with Porsche Motorsports in their No. 8 Quaker State March 88P-Porsche Indy V8. The Porsche engine was less competitive than the Ilmor-Chevrolet and Cosworth engines. Despite the setbacks Fabi managed a best finish of fourth at the Bosch Spark Plug Grand Prix at Pennsylvania International Raceway. Fabis return to the 