#4FACT Q5 Not the First Audi to Be Used as Porsche Test Mule. 928 Mules Were Bertone Designed C1 Coupe S Context The Q5-bodied Cajun mule rounding the Nurburgring this week reminded us of less-known fact about the Porsche 928. Early drivetrain mules of that front-engined V8 GT were fitted...