2019 Alfa Romeo Giulia Quadrifoglio vs. 2019 Audi S4

Detailed Review, Specifications & Comparison

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Both the Giulia Quadrifoglio and the S4 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, crash mitigating brakes, daytime running lights, rearview cameras and available lane departure warning systems.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, with its optional front crash prevention system, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the Giulia Quadrifoglio the rating of “Top Pick” for 2018, a rating granted to only 104 vehicles tested by the IIHS. The S4 has not been tested, yet.


The Giulia Quadrifoglio’s 2.9 turbo V6 produces 156 more horsepower (505 vs. 349) and 74 lbs.-ft. more torque (443 vs. 369) than the S4’s 3.0 turbo V6.

Fuel Economy and Range

An engine control system that can shut down half of the engine’s cylinders helps improve the Giulia Quadrifoglio’s fuel efficiency. The S4 doesn’t offer a system that can shut down part of the engine.

In heavy traffic or at stoplights the Giulia Quadrifoglio’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 S4 doesn’t offer an automatic engine start/stop system.

Brakes and Stopping

For better stopping power the Giulia Quadrifoglio’s brake rotors are larger than those on the S4:

Giulia Quadrifoglio

Giulia Quadrifoglio


Front Rotors

14.2 inches

15.4 inches

13.8 inches

Rear Rotors

13.8 inches

14.2 inches

13 inches

The Giulia Quadrifoglio offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The S4 doesn’t offer ceramic brake rotors.

Tires and Wheels

For better traction and acceleration, the Giulia Quadrifoglio has larger rear tires than the S4 (285/30R19 vs. 245/40R18).

The Giulia Quadrifoglio’s 245/35R19 front and 285/30R19 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the S4’s standard 40 series tires. The Giulia Quadrifoglio’s tires are lower profile than the S4’s optional 35 series tires.

For better ride, handling and brake cooling the Giulia Quadrifoglio has standard 19-inch wheels. Smaller 18-inch wheels are standard on the S4.

Suspension and Handling

For better handling and stability, the track (width between the wheels) on the Giulia Quadrifoglio is 2.4 inches wider in the rear than on the S4.

For better maneuverability, the Giulia Quadrifoglio’s turning circle is .6 feet tighter than the S4’s (37.5 feet vs. 38.1 feet).


The Giulia Quadrifoglio is 4.2 inches shorter than the S4, making the Giulia Quadrifoglio easier to handle, maneuver and park in tight spaces.

Passenger Space

Because it has more passenger and cargo room, the EPA rates the Giulia Quadrifoglio a Mid-size car, while the S4 is rated a Compact.

The Giulia Quadrifoglio has 3.4 cubic feet more passenger volume than the S4 (95.4 vs. 92).

The Giulia Quadrifoglio has 1.1 inches more front legroom, .2 inches more front shoulder room and .2 inches more rear headroom than the S4.


The Giulia Quadrifoglio’s standard easy entry system glides the driver’s seat back, making it easier for the driver to get in and out. The S4 doesn’t offer an easy entry system.

The S4’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The Giulia Quadrifoglio’s standard adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.


The Giulia Quadrifoglio was chosen as one of Car and Driver’s “Top Ten” in 2018. The S4 has never been a Car and Driver “Top Ten” pick.

Motor Trend selected the Giulia Quadrifoglio as their 2018 Car of the Year. The S4 has never been chosen.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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