Mercedes-Benz SL-Class vs Porsche 911 Compare price, expert/user reviews, mpg, engines, safety, cargo capacity and other specs at a glance.

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2020 Mercedes-Benz SL-Class SL 450 RWD
Photo of 2019 model year shown

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User Ranking Drivers and owners ranked these cars in 9 categories.

Used Car Pricing Used listing price comparison and analysis.

2020 Mercedes-Benz SL-Class
SL 450 RWD
CarGurus Instant Market Value
$91,000
8 listings nationwide

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2021 Porsche 911
Carrera 4 Cabriolet AWD
CarGurus Instant Market Value
$119,300

Expert Reviews Reviews from CarGurus experts.

2020 Mercedes-Benz SL-Class
SL 450 RWD
Cherise Threewitt Preview:

The Mercedes-Benz SL-Class is a smooth, spacious, and sporty roadster with a long history. The current generation, which dates back to 2013, was refreshed in 2017 and carries over larg...

2021 Porsche 911
Carrera 4 Cabriolet AWD
Josh Jacquot Preview:

Entering its second year in the 992 generation, Porsche’s iconic 911 remains one of the most versatile and daily drivable sports cars ever made. Its trims and drive configurations enco...

User Reviews Reviews from CarGurus users who have driven or owned the car.

2020 Mercedes-Benz SL-Class
SL 450 RWD
Guru137QX writes:
Back Seats Ranked 2019 Mercedes-Benz E-Class E 450 Cabriolet RWD better.
" E-Class has 4 seats SL 450 only has 2 seats"
Value Ranked 2019 Mercedes-Benz E-Class E 450 Cabriolet RWD worse.
"Only depends what you are looking for, a family or just 2 people"
2021 Porsche 911
Carrera 4 Cabriolet AWD
tswlaw writes:
Power Ranked 2021 Lexus LC 500 Coupe RWD better.
"Not sure"
Looks/Style Ranked 2021 Lexus LC 500 Coupe RWD worse.
"It is a classic"

Specs

2020 Mercedes-Benz SL-Class
SL 450 RWD
2021 Porsche 911
Carrera 4 Cabriolet AWD
Powertrain 9-Speed Automatic 8-Speed Dual Clutch
Drivetrain
RWD
AWD
Fuel Economy, City
20 MPG
18 MPG
Fuel Economy, Highway
28 MPG
24 MPG
Fuel Tank Volume 19.8 gal 17.6 gal
Engine
Fuel Type
Gasoline
Gasoline
Power
362 hp @ 5,000 RPM
379 hp @ 6,500 RPM
Torque
369 lb-ft @ 1,500 RPM
331 lb-ft @ 1,950 RPM
Cylinders
6 cylinders
6 cylinders
Compression Ratio
10.5:1
10.2:1
Displacement
3,000 cc
3,000 cc
Bore x Stroke
3.46 in x 3.23 in
3.58 in x 3.01 in
Safety
ABS Brakes Standard Standard
Driver Airbag Standard Standard
Passenger Airbag Standard Standard
Curtain Airbags Standard --
NHTSA Crash Test Results
Comfort and Convenience
Sunroof/Moonroof Standard --
Leather Seats Standard --
Air Conditioning Standard Standard
CD Player Standard --
CD Changer Standard --
Radio Standard Standard
Power Windows Standard Standard
Power Door Locks Standard Standard
Driver Power Seats Standard Standard
Passenger Power Seats Standard Standard
Interior
Maximum Seating 2 seats 4 seats
Front Legroom 53.6 in --
Back Legroom -- --
Payload and Towing
Cargo Volume 8.5 cu ft 4.6 cu ft
Maximum Payload -- 883 lbs
Exterior
Length 182.3 in 177.9 in
Width 82.6 in 79.7 in
Height 51.2 in 51.1 in
Wheelbase 101.8 in 96.5 in

Available Options

2020 Mercedes-Benz SL-Class
SL 450 RWD

Exterior Colors

  • Black
  • Brilliant Blue Metallic
  • DESIGNO Cardinal Red Metallic
  • DESIGNO Diamond White Metallic
  • Dolomite Brown Metallic
  • Graphite Grey Metallic
  • Iridium Silver Metallic
  • MANUFAKTUR Cardinal Red Metallic
  • MANUFAKTUR Diamond White Metallic
  • MANUFAKTUR Selenite Grey MAGNO
  • Obsidian Black Metallic
  • Polar White
  • Selenite Grey Metallic

Option Packages

  • Bang & Olufsen BeoSound Premium Sound System
  • Soft Close Doors
  • Silver Seat Belts
  • AMG Carbon Fiber Trim
  • Designo Black Piano Lacquer Trim
  • Designo Champagne White Lacquer Trim
  • Designo Classic Red Leather Package
  • Red Seat Belts
  • Wood/Leather Steering Wheel
  • AMG Sport Steering Wheel In Leather/DINAMICA
  • Active Body Control (ABC)
  • DESIGNO Deep White/Black Leather Package
  • DESIGNO Light Brown/Black Leather Package
  • DESIGNO Platinum White/Black Leather Package
  • DESIGNO Sand/Black Leather Package
  • DESIGNO Sienna Brown/Black Leather Package
  • DESIGNO Titanium Grey Pearl/Black Leather Package
  • DESIGNO Tuscany Beige Pearl/Black Leather Package
  • Driver Assistance Package
  • Premium Package
  • Designo Bamboo Trim
  • Bengal Red/Black, Exclusive Nappa Leather Upholstery
  • Black Perforated Nappa Leather Upholstery
  • Black, Exclusive Nappa Leather Upholstery
  • Black, Nappa Leather Upholstery
  • Ginger Beige/Espresso, Exclusive Nappa Leather Upholstery
  • Porcelain/Black, Exclusive Nappa Leather Upholstery
  • Porcelain/Black, Perforated Nappa Leather Upholstery
  • Saddle Brown/Black, Exclusive Nappa Leather Upholstery
  • Bengal Red/Black, Perforated Nappa Leather Upholstery
  • Ginger Beige/Espresso, Perforated Nappa Leather Upholstery
  • Porcelain/Black, Perforated Nappa Leather Upholstery
  • Saddle Brown/Black, Perforated Nappa Leather Upholstery
  • Magic Sky Control
  • Wheels: 19" AMG Multi-Spoke Alloy
2021 Porsche 911
Carrera 4 Cabriolet AWD

Exterior Colors

  • Agate Grey Metallic
  • Aventurine Green Metallic
  • Black
  • Carmine Red
  • Carrara White Metallic
  • Chalk
  • Custom Color
  • Dolomite Silver Metallic
  • GT Silver Metallic
  • Gentian Blue Metallic
  • Guards Red
  • Jet Black Metallic
  • Lava Orange
  • Miami Blue
  • Night Blue Metallic
  • Python Green
  • Racing Yellow
  • White

Option Packages

  • Bose Surround Sound System
  • Burmester High-End Surround Sound System
  • Sport Tailpipes in Black
  • Sport Tailpipes in Silver
  • SportDesign Side Skirts
  • Seat Belts in Bordeaux Red
  • Seat Belts in Chalk
  • PDK Gear Selector in Aluminum
  • 911 CARRERA 4 Stripe Decal On Side In Aurum
  • 911 CARRERA 4 Stripe Decal On Side In Black
  • 911 CARRERA 4 Stripe Decal On Side In Red
  • 911 CARRERA 4 Stripe Decal On Side In Silver
  • 930 Leather Package
  • Adaptive Cruise Control (Acc)
  • Air Vent Surround & Air Vent Slats In Leather
  • Air Vent Surround In LTHR & Air Vent Slats Painted
  • Ambient Lighting
  • Clear Taillights
  • Deviated Leather Seat Centers
  • Deviated Stitching Interior PKG & LTR Seat Centers
  • Deviated Stitching Interior Package
  • Double Stripe Decal On Front Trunk Lid In Grey
  • Electric Steering Column W/Casing In Leather
  • Exclusive MANUFAKTUR Leather Interior
  • Extended Door Trim In Leather
  • Extended Exclusive MANUFAKTUR Leather Interior
  • Extended Heritage Design Leather Package
  • Exterior Mirror Base In High Gloss Black
  • Exterior Mirror Lower Trim & Base In Ext Color
  • Exterior Mirror Upper Housing In Carbon Fiber
  • Floor Mats W/Leather Edging
  • Front Axle Lift System
  • Front Protection Film
  • GT Sport Steering Wheel In Race-Tex
  • GT Sport Steering Wheel In Race-Tex W/Carbon Fiber
  • Heated GT Sport Steering Wheel
  • Heated GT Sport Steering Wheel In Race-Tex
  • Heated GT Sport Steering Wheel W/Carbon Fiber
  • Heritage Design Interior Package
  • ILLUM Personalized Door-Sill Guards In Brushed Alum
  • ILLUM Personalized Door-Sill Guards In Carbon Fiber
  • Illuminated Door-Sill Guards In Brushed Aluminum
  • Illuminated Door-Sill Guards In Matte Carbon Fiber
  • Inner Door-Sill Guards In Leather
  • Interior Mirror In Leather
  • Interior Trim In Light Silver
  • Interior Trim Inlays In Brushed Aluminum
  • Interior Trim Inlays In Exterior Color
  • Interior Trim Inlays In Leather
  • Interior Trim Inlays In Matte Carbon Fiber
  • Interior Trim Inlays In PALDAO
  • Lane Change Assist (LCA)
  • Lane Keep Assist (LKA) W/Traffic Sign Recognition
  • Led-Matrix Design Headlights In Black W/PDLS+
  • Led-Matrix Design Headlights W/PDLS+
  • Manual Steering Column W/Casing In Leather
  • Night Vision Assist
  • Owner's Manual Wallet In Carbon Fiber
  • Owner's Manual Wallet In Leather
  • Pedals & Footrest In Aluminum
  • Personalized Air Vent Surround & Air Vent Slats
  • Personalized Floor Mats W/Leather Edging
  • Porsche Ceramic Composite Brakes (PCCB) In Yellow
  • Porsche Dynamic Light System Plus (PDLS+)
  • Porsche INNODRIVE W/Acc & Alk
  • Porsche Logo Decal On Side In Aurum
  • Porsche Logo Decal On Side In Black
  • Porsche Logo Decal On Side In Red
  • Porsche Logo Decal On Side In Silver
  • Porsche Torque Vectoring Plus (PTV+)
  • Premium Package
  • RR Lid Grille Vertical Slat Inlays In Exterior Color
  • RR Lid Grille Vertical Slat Inlays In High Gloss Black
  • Seat Belts In Agave Green
  • Seat Belts In Guards Red
  • Seat Belts In Lizard Green
  • Seat Belts In Racing Yellow
  • Seat Belts In Silver Grey
  • Seat Belts In Truffle Brown
  • Sport CHRONO Package
  • Sport Exhaust System
  • Sport Exhaust System W/Tailpipes In Black
  • Sport Exhaust System W/Tailpipes In Silver
  • Sport Package
  • Sportdesign Front Fascia
  • Sportdesign Package
  • Sportdesign Package In High Gloss Black
  • Sun Visors In Leather
  • Sun Visors In Race-Tex
  • Surround View
  • Vehicle Keys In Leather W/1 Key Pouch
  • Vehicle Keys Painted W/1 Key Pouch In Leather
  • Vehicle Keys Painted W/1 Key Pouch In Race-Tex
  • Wheels Painted In Exterior Color
  • Wheels Painted In High Gloss Black
  • Wheels Painted In Jet Black Metallic
  • Wheels Painted In Satin Aurum
  • Wheels Painted In Satin Black
  • Wheels Painted In Satin Platinum
  • Agave Green, Club Leather Seat Trim
  • Agave Green, Club Leather Seat Trim W/Chalk Stitching
  • Black, LTHR Seat Trim W/LTHR Interior & Chalk Stitching
  • Black, LTHR Seat Trim W/Sport-Tex Centers & Chalk Stitching
  • Black, Leather Seat Trim W/Leather Interior
  • Black, Leather Seat Trim W/Leather Package
  • Black, Leather Seat Trim W/Sport-Tex Centers
  • Bordeaux Red, LTHR Seat Trim W/LTHR Interior & Chalk Stitching
  • Bordeaux Red, Leather Seat Trim W/Leather Interior
  • Bordeaux Red/Black, Leather Seat Trim W/Two-Tone Leather Interior
  • Chalk/Slate Grey, Leather Seat Trim W/Two-Tone Leather Interior
  • Graphite Blue, LTHR Seat Trim W/LTHR Interior & Chalk Stitching
  • Graphite Blue, Leather Seat Trim W/Leather Interior
  • Iceland Green/Black, Leather Seat Trim W/Two-Tone Leather Interior
  • Mojave Beige/Black, Leather Seat Trim W/Two-Tone Interior
  • Mojave Beige/Black, Leather Seat Trim W/Two-Tone Leather Interior
  • Slate Grey, LTHR Seat Trim W/LTHR Interior & Chalk Stitching
  • Slate Grey, Leather Seat Trim W/Leather Interior
  • Slate Grey, Leather Seat Trim W/Leather Package
  • Truffle Brown, Club Leather Seat Trim
  • Truffle Brown, Club Leather Seat Trim W/Chalk Stitching
  • 14-Way Power Seats W/Memory Package
  • 18-Way Adaptive Sport Seats Plus W/Memory Package
  • 4-Way Sport Seats Plus
  • Ventilated Front Seats
  • Wheels: 20" Front/21" Rear 911 Turbo
  • Wheels: 20" Front/21" Rear CARRERA Classic
  • Wheels: 20" Front/21" Rear CARRERA Exclusive Design
  • Wheels: 20" Front/21" Rear CARRERA S
  • Wheels: 20" Front/21" Rear RS SPYDER Design

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