Task: Question Generation
Input (English): Passage: In 1993, Porsche Motorsports at Weissach briefly produced a Turbocharger 968 Turbo S, a fairly odd naming choice for Porsche which usually reserves the added "S" moniker for models that have been tuned for more power over a "lesser" counterpart, such as with the 911 Turbo. The 968 Turbo S shared the same body and interior as the Club Sport and visually can be identified by the NACA bonnet hood scoops, adjustable rear wing and deeper front spoiler. Powered by a large 8 valve SOHC cylinder head (944 Turbo S) with a 3.0 L 944S2 style engine block. Tests conducted in 1993 produced a 0 to  time of 4.7 seconds and a top speed of , performance comparable to the much newer Porsche 996 911. It generated  at 5,600 rpm with a maximum torque of  at 3,000 rpm. Only 16 were produced in total and only for sale in mainland Europe.
Output (English): What does the "S" usually indicate on Porsche Motorsports models?