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The S5’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 718 Boxster doesn’t offer pre-crash pretensioners.
The S5’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The 718 Boxster doesn’t offer a whiplash protection system.
The S5 has standard Secondary Collision Brake Assist, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The 718 Boxster doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
The S5 has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The 718 Boxster doesn’t offer all-wheel drive.
The S5 Prestige’s lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The 718 Boxster doesn’t offer a lane departure warning system.
The S5 Prestige has a standard Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The 718 Boxster only offers a rear monitor and front and rear parking sensors that beep. That doesn’t help with obstacles to the sides.
To help make backing safer, the S5’s optional 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 718 Boxster doesn’t offer a cross-path warning system.
Both the S5 and the 718 Boxster have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras and available blind spot warning systems.
The Audi S5 weighs 711 to 1267 pounds more than the Porsche 718 Boxster. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.
For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and its standard front crash prevention system, the Insurance Institute for Highway Safety grants the S5 the rating of “Top Pick” for 2017, a rating granted to only 139 vehicles tested by the IIHS. The 718 Boxster has not been tested, yet.
There are over 59 percent more Audi dealers than there are Porsche dealers, which makes it much easier should you ever need service under the S5’s warranty.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Porsche vehicles. Consumer Reports ranks Audi 4 places higher in reliability than Porsche.
The S5’s 3.0 turbo V6 produces 49 more horsepower (349 vs. 300) and 89 lbs.-ft. more torque (369 vs. 280) than the 718 Boxster’s standard 2.0 turbo 4 cyl. The S5’s 3.0 turbo V6 produces 60 lbs.-ft. more torque (369 vs. 309) than the 718 Boxster S’ standard 2.5 turbo 4 cyl. The S5’s 3.0 turbo V6 produces 60 lbs.-ft. more torque (369 vs. 309) than the 718 Boxster GTS’ standard 2.5 turbo 4 cyl. The S5’s 3.0 turbo V6 produces 52 lbs.-ft. more torque (369 vs. 317) than the 718 Boxster GTS’ optional 2.5 turbo 4 cyl.
The S5 has 1.1 gallons more fuel capacity than the 718 Boxster’s standard fuel tank (15.3 vs. 14.2 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi S5 higher (5 out of 10) than the Porsche 718 Boxster (3). This means the S5 produces up to 16.5 pounds less smog-producing pollutants than the 718 Boxster every 15,000 miles.
The Audi S5 comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 718 Boxster.
An eight-speed automatic is standard on the Audi S5, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 718 Boxster.
All-wheel drive, available in the S5, provides the best traction for acceleration in wet, dry, and icy conditions. In corners, all-wheel drive allows both outside wheels to provide power, balancing the car. This allows for better handling. The Porsche 718 Boxster is not available with all-wheel drive.
For better stopping power the S5’s brake rotors are larger than those on the 718 Boxster:
For better traction, the S5 has larger standard tires than the 718 Boxster (245/40R18 vs. 235/45R18). The S5’s optional tires are larger than the largest tires available on the 718 Boxster (265/30R20 vs. 245/35R20).
The S5’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the 718 Boxster’s standard 45 series tires. The S5’s optional tires have a lower 30 series profile than the 718 Boxster’s optional 35 series front tires.
For a smoother ride and more stable handling, the S5 Cabriolet’s wheelbase is 11.5 inches longer than on the 718 Boxster (108.9 inches vs. 97.4 inches).
For better handling and stability, the track (width between the wheels) on the S5 is 2.7 inches wider in the front and 1.3 inches wider in the rear than the average track on the 718 Boxster.
The design of the Audi S5 amounts to more than styling. The S5 offers aerodynamic coefficients of drag from .29 to .3 Cd (depending on bodystyle and options). That is lower than the 718 Boxster (.31 to .32). A more efficient exterior helps the S5 go faster and keeps the interior quieter. It also helps the S5 get better fuel mileage.
The S5 has standard seating for 4 passengers; the 718 Boxster can only carry 2.
The S5 Cabriolet has 32 cubic feet more passenger volume than the 718 Boxster (81 vs. 49).
With its coupe body style, valet key, locking rear seatbacks and remote trunk release lockout, the S5 offers cargo security. The 718 Boxster’s non-lockable remote release defeats cargo security.
The S5 Prestige has a standard heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The 718 Boxster doesn’t offer a heads-up display.
If the windows are left open on the S5 the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 718 Boxster can only operate the windows from inside the vehicle, with the ignition on.
The S5’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The 718 Boxster’s standard manually variable intermittent wipers have to be constantly adjusted.
Heated windshield washer nozzles are standard on the S5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 718 Boxster doesn’t offer heated windshield washer nozzles.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the S5 has standard extendable sun visors. The 718 Boxster doesn’t offer extendable visors.
The S5’s sun-visors swivel front-to-side to block glare from the side windows. The 718 Boxster’s visors are fixed into the windshield header.
The S5 has a standard dual zone air-conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. Dual zone air-conditioning costs extra on the 718 Boxster.
The S5 Prestige’s Park Steering Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The 718 Boxster doesn’t offer an automated parking system.
The Audi S5 comes in coupe, convertible and four-door hatchback bodystyles; the Porsche 718 Boxster isn’t available as a coupe or four-door.
The Audi A5/S5/RS 5 outsold the Porsche Boxster by over thirteen to one during the 2018 model year.
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