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Mercedes-Benz C63 AMG vs Porsche 718 Cayman

Side-by-side comparison from manufacturer specifications, NHTSA safety data, and live dealer listings.

Vehicles

Mercedes-Benz logo

2021 Mercedes-Benz C63 AMG

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Porsche logo

2025 Porsche 718 Cayman

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Overview

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
Selected trimAMG C 63718 Cayman Coupe
Body styleSedanCoupe
Drivetrainrear wheel driverear wheel drive
Fuel typepremium unleaded (required)premium unleaded (required)
Transmission9-speed shiftable automatic7-speed automated manual
Engine typegasgas
Model year20212025

Pricing & market

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
MSRP$68,600 (best)$72,800
Lowest listing price—$54,739 (best)
Median listing price—$114,999 (best)
Highest listing price—$189,900 (best)
For sale now03 (best)

Fuel economy & range

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
Combined MPG21 MPG24 MPG (best)
City MPG17 MPG21 MPG (best)
Highway MPG26 MPG27 MPG (best)
Fuel tank17.4 gal (best)14.2 gal

Performance

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
Horsepower469 hp (best)300 hp
Torque479 lb-ft (best)280 lb-ft
Engine size4 L (best)2 L
CylindersV8flat 4

Size & capability

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
Seating5 seats (best)2 seats
Doors4 (best)2
Cargo volume12.6 cu ft15 cu ft (best)
Payload—611 lbs (best)
Curb weight3,874 lbs3,104 lbs (best)
Ground clearance3.6 in (best)—
Wheelbase111.8 in (best)97.4 in
Length187.2 in (best)172.4 in
Width72.4 in (best)70.9 in
Height56.1 in (best)51 in

Safety & recalls

SpecMercedes-Benz C63 AMGAMG C 63Porsche 718 Cayman718 Cayman Coupe
Open recalls (YMM scope)None reportedNone reported

Highlighted values indicate the better figure for that spec when a clear winner exists. Specs reflect the selected trim for each vehicle. Drag a vehicle header to reorder columns. MSRP and specifications are manufacturer data; listing prices and inventory come from live dealer listings. Safety ratings are from NHTSA.

Trim overview

All available trims with MSRP. The trim selected above is highlighted; comparison specs use that selection.

TrimMercedes-Benz C63 AMGPorsche 718 Cayman
1

AMG C 63

$68,600 MSRP(Currently comparing)

718 Cayman Coupe

$72,800 MSRP(Currently comparing)

2

AMG C 63

$70,650 MSRP

Style Edition

$79,200 MSRP

3

AMG C 63

$78,000 MSRP

S

$84,800 MSRP

4—

GTS 4.0

$99,700 MSRP

5—

GT4 RS

$164,200 MSRP

Live inventory

Mercedes-Benz C63 AMG vs Porsche 718 Cayman FAQ

Which is better: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
It depends on priorities. OpenDealer compares 2021 Mercedes-Benz C63 AMG vs 2025 Porsche 718 Cayman on MSRP, fuel economy, horsepower, seating, towing, NHTSA safety ratings, and live market prices so you can weigh the tradeoffs.
Which costs less: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
Based on starting MSRP, the 2021 Mercedes-Benz C63 AMG starts lower at $68,600. Live Porsche 718 Cayman listings start at $54,739.
Which has better startingMsrp: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
The 2021 Mercedes-Benz C63 AMG leads on startingMsrp in this comparison (68,600).
Which has better combinedMpg: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
The 2025 Porsche 718 Cayman leads on combinedMpg in this comparison (24).
Which has better horsepower: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
The 2025 Porsche 718 Cayman leads on horsepower in this comparison (493).
Which has better seats: 2021 Mercedes-Benz C63 AMG or 2025 Porsche 718 Cayman?
The 2021 Mercedes-Benz C63 AMG leads on seats in this comparison (5).