What is the difference of 2002 Porsche carerra carerra4 4s?

* Base model

* 3.6-liter flat-six engine

* 320 horsepower

* 273 lb-ft of torque

* Rear-wheel drive

* Six-speed manual transmission

2002 Porsche Carrera 4

* All-wheel drive

* Otherwise identical to the Carrera

2002 Porsche Carrera 4S

* Wider body

* Larger brakes

* Sport suspension

* 18-inch wheels

* Otherwise identical to the Carrera 4