VS
At a Glance
Power
577hp @ 5500
502hp @ 8400
Torque
590lb-ft @ 2500
331lb-ft @ 6100
Fuel
18 mpg est.
—
Engine
4.0 L/243ci
4.0 L/244ci
Choosing between the Mercedes-Benz Sl Class and the Porsche 911 is one of the most common decisions car buyers in the United States face. The Mercedes-Benz Sl Class delivers 577hp @ 5500 while the Porsche 911 produces 502hp @ 8400. Pricing starts at $112,550 for the Sl Class and $235,800 for the 911. Both vehicles have their merits. The right choice depends on your priorities: fuel economy, performance, towing ability, safety features or total cost of ownership. This comparison covers every specification available so you can make an informed decision.
Specification
Mercedes-Benz Sl ClassAMG SL 63 Roadster 2026 - From $112,550
Porsche 911GT3 Coupe 2026 - From $235,800
Performance
Power Output (hp)
577hp @ 5500
502hp @ 8400
Torque (lb-ft)
590lb-ft @ 2500
331lb-ft @ 6100
Engine & Drivetrain
Engine Capacity
4.0 L/243ci
4.0 L/244ci
Engine Layout
—
Flat/Boxer
Cylinders
8
6
Fuel Type
Gasoline
Gasoline
Forced Induction Device
Turbocharged
—
Transmission
Automatic
Automatic
Number of Gears
—
6
Drive Wheels
All Wheel Drive
Rear Wheel Drive
Fuel Economy
Fuel Economy (Combined, est.)
18 mpg est.
—
Fuel Economy - City (mpg)
14 (2025)mpg
—
Fuel Economy - Highway (mpg)
21 (2025)mpg
—
Fuel Tank Capacity (gal)
18.5gal
16.6gal
Dimensions
Length (in)
185.2in
179.9in
Width (in)
75.4in
72.9in
Height (in)
53.5in
50.4in
Wheelbase (in)
106.3in
96.7in
Curb Weight (lbs)
4321lbs
3278lbs
Safety
ABS
✓ Standard
✓ Standard
Brake Assist
✓ Standard
✓ Standard
Stability Control
✓ Standard
✓ Standard
Traction Control
✓ Standard
✓ Standard
Driver Airbag
✓ Standard
✓ Standard
Passenger Airbag
✓ Standard
✓ Standard
Side Airbags Front
✓ Standard
✓ Standard
Curtain Airbags
✓ Standard
✓ Standard
Features & Tech
Air Conditioning
✓ Standard
✓ Standard
Climate Control
✓ Standard
✓ Standard
Cruise Control
✓ Standard
✓ Standard
Adaptive Cruise Control
✓ Standard
—
Bluetooth
✓ Standard
✓ Standard
Backup Camera
✓ Standard
✓ Standard
Rear Parking Aid
✓ Standard
✓ Standard
Heated Seats
✓ Standard
✓ Standard
Power Seat Adjustment
✓ Standard
✓ Standard
Keyless Entry
✓ Standard
✓ Standard
Alloy Wheels
✓ Standard
✓ Standard
The Verdict
Which Wins?
Overall Winner
Mercedes-Benz Sl Class
2 / 4 categories
Performance
Sl Class
Fuel Economy
Tied
Value
Sl Class
Practicality
Tied
Pros & Cons
Mercedes-Benz Sl Class
Lower starting price ($112,550)
Few notable weaknesses
Porsche 911
Well-rounded specification
Higher starting price
Frequently Asked Questions
Which has more power, the Sl Class or 911?
The Sl Class produces 577hp @ 5500 and 590lb-ft @ 2500 of torque while the 911 delivers 502hp @ 8400 and 331lb-ft @ 6100 of torque. The Sl Class is the more powerful option.
What is the price difference between the Sl Class and 911?
The Sl Class starts from $112,550 and the 911 from $235,800. The Sl Class is cheaper by $123,250 at this variant level. Final on-the-road pricing varies by dealer and specification.
Should I buy the Sl Class or the 911?
It depends on your priorities. If fuel economy matters most, check the mpg figures above. If you need towing capacity, compare the towing ratings. For day-to-day driving - commutes, school runs and highway trips - consider ground clearance, service network coverage, and total cost of ownership including insurance and maintenance. Use the spec tables above to compare every detail before making your decision.
Also Consider