This 1988 Porsche 928 S4 is powered by a 5.0-liter V8 that has been modified with a Murf928 Super Shark supercharger kit. The body is finished in black, and equipment includes a sunroof, air conditioning, power-adjustable seats, a Clarion CD player, aftermarket cabin speakers, aftermarket suspension components, and 18″ wheels. The car was acquired by the seller in 2012, and service in September 2020 reportedly included replacing the timing belt, water pump, fuel injectors, and spark plugs,…