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The 911 has standard head airbag curtains which act as a forgiving barrier between the driver and passenger’s upper bodies and the window and pillars. Combined with high-strength steel door beams and lower side airbags this system increases head protection in broadside collisions. The DB9 doesn’t offer side airbag protection for the head.
Both the 911 and the DB9 have standard driver and passenger frontal airbags, front side-impact airbags, front seatbelt pretensioners, four wheel antilock brakes, electronic stability systems to prevent skidding and available traction control.
The 911 comes with a full 4 year/50,000 mile basic warranty, which covers the entire car. The DB9’s 3 year basic warranty expires 1 year sooner.
The 911 comes with free roadside assistance for 4 years 50,000 miles. Porsche will send help if you run out of gas, need a jump start, lock your keys in or need any assistance on the road. Aston Martin doesn’t give free roadside assistance for the DB9.
The 911’s corrosion warranty is 7 years longer than the DB9’s (10 vs. 3 years).
There are over 16 times as many Porsche dealers as there are Aston Martin dealers, which makes it much easier to get service under the 911’s warranty.
The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The DB9 doesn’t offer a boxer engine configuration.
The 911 stops much shorter than the DB9:
70 to 0 MPH
Car and Driver
The 911 S’ 235/30R19 front tires provide better handling because they have a lower 30 series profile (height to width ratio) which provides a stiffer sidewall than the DB9’s 40 series front tires.
The 911 has standard front and rear gas-charged shocks for better control over choppy roads. The DB9’s suspension doesn’t offer gas-charged shocks.
The 911 offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The DB9’s suspension doesn’t offer adjustable shock absorbers.
The 911 S handles at .97 G’s, while the DB9 pulls only .96 G’s of cornering force in a Car and Driver skidpad test.
The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 800 to 950 pounds less than the Aston Martin DB9.
The 911 is 9.3 inches shorter than the DB9, making the 911 easier to handle, maneuver and park in tight spaces.
As tested by Car and Driver while under full throttle, the interior of the 911 is quieter than the DB9 (83 vs. 86 dB).
When four different drivers share the 911, the optional memory seats and mirrors make it convenient for all four. Each setting activates different, customized memories for the seat position and outside mirror positions. The DB9 doesn’t offer a memory system.
The 911’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 DB9 does not have an oil pressure gauge.
The 911’s power windows raise and lower automatically with one touch, especially convenient at tollbooths or drive-up windows. The power windows on the DB9 don’t raise automatically.