“Like the 911 Turbo, the Carrera 4S rides lower than the Carrera 4 on a stiffer suspension tuned for crisp, mid-corner balance and straight-line stability. The standard Porsche Active Suspension Management (PASM) system automatically adjusts to changing road conditions. An added feature allows a choice of two modes – Normal and Sport – to further fine-tune the suspension simply with the touch of a button.
The primal rush of 355 horse-power is sent to the pavement, anchored at each corner by 19-inch aluminum-alloy wheels and wider 305/30 ZR 19 rear tires. The only thing missing? Racing decals. Amen”
2008 Porsche 911 Product Guide, page 19, paragraphs 1-2