That must be the "sport" option (520hp Porsche 993 twin-turbo drivetrain)
My first car was a 74 bus. We dumped all the smog stuff first, then after about 50K miles we rebuilt the engine and re geared the trans axel. Helps to have friends who worked for VW. Punched it out to a 2.2 liter, dumped the Solex Carbs for Weber etc.....
CHP said they clocked me 90 MPH and I still had some room on the tach for more.
