For enhanced safety, the front and rear seat shoulder belts of the Maserati Quattroporte have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Audi S8 doesn’t offer pretensioners for the rear seat belts.
To help make backing safer, the Quattroporte’s cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The S8 doesn’t offer a cross-path warning system.
Both the Quattroporte and the S8 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, blind spot warning systems, rearview cameras, available crash mitigating brakes, lane departure warning systems and around view monitors.
In heavy traffic or at stoplights the Quattroporte’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The S8 doesn’t offer an automatic engine start/stop system.
The Quattroporte has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The S8 doesn’t offer a cap-less fueling system.
The Quattroporte’s optional 285/30R21 rear tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the S8’s 35 series tires.
For a smoother ride and more stable handling, the Quattroporte’s wheelbase is 6.9 inches longer than on the S8 (124.8 inches vs. 117.9 inches).
The Quattroporte’s front to rear weight distribution is more even (50% to 50%) than the S8’s (56.4% to 43.6%). This gives the Quattroporte more stable handling and braking.
For better maneuverability, the Quattroporte’s turning circle is 1.7 feet tighter than the S8’s (38.7 feet vs. 40.4 feet).
The Maserati Quattroporte may be more efficient, handle and accelerate better because it weighs about 450 to 600 pounds less than the Audi S8.
Because it has more passenger and cargo room, the Quattroporte is rated a Large car by the EPA, while the S8 is rated a Mid-size.
The Quattroporte has 12.1 cubic feet more passenger volume than the S8 (114 vs. 101.9).
The Quattroporte has 1.4 inches more front headroom and 5.2 inches more front shoulder room than the S8.
For enhanced passenger comfort on long trips the Quattroporte’s available rear seats recline. The S8’s rear seats don’t recline.
The Quattroporte has a much larger trunk than the S8 (18.7 vs. 14.2 cubic feet).
The Quattroporte’s standard rear seats fold to accommodate long and bulky cargo. The S8 doesn’t offer folding rear seats, only a ski pass-through.
The Quattroporte has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The S8 doesn’t offer a remote starting system.
The Quattroporte’s instruments include an oil pressure gauge and a temperature gauge – which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The S8 does not have an oil pressure gauge.
When the Quattroporte is put in reverse, both rearview mirrors tilt from their original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirrors into their original positions. The S8’s mirrors don’t automatically adjust for backing.
Optional air conditioned front and rear seats keep the Quattroporte’s passengers comfortable and take the sting out of hot leather in Summer. The S8 doesn’t offer air conditioned seats in the rear.
Standard smartphone integration for the Quattroporte allows the driver and passengers access to select programs on their smartphones, including reading text messages aloud, playing internet radio stations, searching the internet and other connected activities without taking their eyes off the road or their hands from the wheel. The S8 doesn’t offer factory integrated smartphone program access.
The Quattroporte offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The S8 doesn’t offer a house-current electrical outlet.