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For enhanced safety, the front seat shoulder belts of the Maserati Quattroporte are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The BMW old 6 Series Gran Coupe doesn’t offer height-adjustable 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 old 6 Series Gran Coupe doesn’t offer a cross-path warning system.
Both the Quattroporte and the old 6 Series Gran Coupe have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.
The Quattroporte GTS’ 3.8 turbo V8 produces 22 lbs.-ft. more torque (524 vs. 502) than the M6 Gran Coupe Competition’s optional 4.4 turbo V8.
The Quattroporte has 2.5 gallons more fuel capacity than the old 6 Series Gran Coupe’s standard fuel tank (21 vs. 18.5 gallons), for longer range between fill-ups.
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 old 6 Series Gran Coupe doesn’t offer a cap-less fueling system.
For better stopping power the Quattroporte’s standard brake rotors are larger than those on the old 6 Series Gran Coupe:
old 6 Series Gran Coupe
For better traction and acceleration, the Quattroporte has larger standard rear tires than the old 6 Series Gran Coupe (275/40R19 vs. 245/45R18).
The Quattroporte’s standard 275/40R19 rear tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the 640i Gran Coupe’s standard 45 series tires.
For better ride, handling and brake cooling the Quattroporte has standard 19-inch wheels. Smaller 18-inch wheels are standard on the 640i Gran Coupe. The Quattroporte’s optional 21-inch wheels are larger than the 20-inch wheels optional on the old 6 Series Gran Coupe.
The Quattroporte has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the old 6 Series Gran Coupe; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the old 6 Series Gran Coupe don’t have a run-flat feature, either.
The Quattroporte’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The old 6 Series Gran Coupe doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the Quattroporte’s wheelbase is 8.1 inches longer than on the old 6 Series Gran Coupe (124.8 inches vs. 116.7 inches).
For better maneuverability, the Quattroporte’s turning circle is .5 feet tighter than the old 6 Series Gran Coupe’s (38.7 feet vs. 39.2 feet). The Quattroporte’s turning circle is 2.3 feet tighter than the M6 Gran Coupe’s (38.7 feet vs. 41 feet).
The design of the Maserati Quattroporte amounts to more than styling. The Quattroporte has an aerodynamic coefficient of drag of .28 Cd. That is lower than the old 6 Series Gran Coupe (.29 to .33) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the Quattroporte get better fuel mileage.
The front grille of the Quattroporte uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The old 6 Series Gran Coupe doesn’t offer active grille shutters.
Because it has more passenger and cargo room, the EPA rates the Quattroporte a Large car, while the old 6 Series Gran Coupe is rated a Compact.
The Quattroporte has 17 cubic feet more passenger volume than the old 6 Series Gran Coupe (114 vs. 97).
The Quattroporte has 5.1 inches more front hip room, 7.6 inches more front shoulder room, .8 inches more rear headroom, .6 inches more rear hip room and .7 inches more rear shoulder room than the old 6 Series Gran Coupe.
For enhanced passenger comfort on long trips the Quattroporte’s available rear seats recline. The old 6 Series Gran Coupe’s rear seats don’t recline.
The Quattroporte has a much larger trunk than the old 6 Series Gran Coupe with its rear seat up (18.7 vs. 12 cubic feet).
To make loading and unloading groceries and cargo easier when your hands are full, the Quattroporte’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The old 6 Series Gran Coupe doesn’t offer a power or hands-free opening trunk.
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 old 6 Series Gran Coupe 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 old 6 Series Gran Coupe does not have an oil pressure gauge.
Heated windshield washer nozzles are standard on the Quattroporte to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The old 6 Series Gran Coupe doesn’t offer heated windshield washer nozzles.
Optional air conditioned front and rear seats keep the Quattroporte’s passengers comfortable and take the sting out of hot leather in summer. The old 6 Series Gran Coupe doesn’t offer air-conditioned seats in the rear.
The Quattroporte has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the car heater warms up. A heated steering wheel costs extra on the old 6 Series Gran Coupe.
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 old 6 Series Gran Coupe doesn’t offer a house-current electrical outlet.
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