Car comparison

Porsche Boxster (987) S 3.4vsMercedes-Benz SLK (R171) · Facelift 2008 SLK 350 V6

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

Porsche Boxster (987)

S 3.4

295 hp3387 ccGasolineRWDManualNaturally aspiratedRoadster2006-2009
VS

Mercedes-Benz SLK (R171) · Facelift 2008

SLK 350 V6

305 hp3498 ccGasolineRWDManualNaturally aspiratedRoadster2008-2011

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6

  • Most powerful
    305 hp
    227 kW
  • Highest torque
    360 Nm
    266 lb-ft
  • Lowest combined fuel consumption
    9.7 L/100 km
    24.2 mpg US
    29.1 mpg UK
  • Lowest city consumption
    14.5 L/100 km
    16.2 mpg US
    19.5 mpg UK
  • Lowest highway consumption
    7.0 L/100 km
    33.6 mpg US
    40.4 mpg UK
  • Best estimated range
    722 km
    448 mi
  • Largest trunk
    208 L
  • Best overall score
    55/100
  • Best performance score
    67/100
  • Best economy score
    81/100
  • Best practicality score
    29/100

Porsche Boxster (987) S 3.4

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    272 km/h
    169 mph
  • Lightest
    1,355 kg
    2,987 lb
  • Best power-to-weight
    218 hp/t
    162 kW/t
    4.6 kg/hp

Specification comparison

Specification comparison
ModelPorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
295hp220kW
305hp227kW
Torque
340Nm251lb-ft
360Nm266lb-ft
Curb weight
1,355kg2,987lb
1,430kg3,153lb
Gross weight
1,630kg3,594lb
1,800kg3,968lb
Top speed
272 km/h
169 mph
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
80.6s99% target: 269 km/h / 167 mph
Calculated
70.5s99% target: 267 km/h / 166 mph
Calculated
0-100 km/h
5.4s
5.4s
0-200 km/h
18.8s
17.9s
Calculated
0-60 mph
5.1s
Calculated
5.1s
Calculated
Fuel consumption
10.6L/100 km22.2mpg US26.6mpg UK
9.7L/100 km24.2mpg US29.1mpg UK
Fuel consumption city
15.3L/100 km15.4mpg US18.5mpg UK
14.5L/100 km16.2mpg US19.5mpg UK
Fuel consumption highway
7.8L/100 km30.2mpg US36.2mpg UK
7L/100 km33.6mpg US40.4mpg UK
Quarter mile
13.5s
Calculated
13.4s
Calculated
Power-to-weight
218hp/t162kW/t99hp/1000 lb
Calculated
213hp/t159kW/t97hp/1000 lb
Calculated
Torque-to-weight
251Nm/t168lb-ft/ton
Calculated
252Nm/t168lb-ft/ton
Calculated
Estimated range
604km375mi
Calculated
722km448mi
Calculated
Displacement
3,387cc207cu in
3,498cc213cu in
Length
4,329mm170in
4,107mm162in
Width
1,801mm71in
1,788mm70in
Height
1,292mm51in
1,298mm51in
Wheelbase
2,415mm95in
2,430mm96in
Front track
1,486mm59in
1,526mm60in
Rear track
1,528mm60in
1,549mm61in
Ground clearance
121mm5in
-
Trunk volume
130L
208L
Doors
2
2
Seats
2
2
Fuel tank
64L
70L
CO2 emissions
254g/km
-

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

Porsche Boxster (987) S 3.4Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6PowerTorque
  • Porsche Boxster (987) S 3.4: Power / Torque
  • Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (987)S 3.46,250 rpm4,400-6,000 rpm7,300 rpm
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V66,500 rpm4,900 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.1 s
0-100 km/h
0-62 mph
5.4 s
5.4 s
0-200 km/h
0-124 mph
18.8 s
17.9 s
Top speed
272 km/h
169 mph
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.2 s
2.3 s
330 ft
101 m
5.9 s
5.9 s
1/8 mile
201 m
8.8 s
8.9 s
1000 ft
305 m
11.4 s
11.4 s
1/4 mile
402 m
13.5 s
13.4 s
Trap speed
1/4 mile
402 m
172 km/h
107 mph
175 km/h
109 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
295 hp
220 kW
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
305 hp
227 kW

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 has 10 hp more than Porsche Boxster (987) S 3.4.

The biggest power difference is between Porsche Boxster (987) S 3.4 and Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6: 10 hp (7 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
340 Nm
251 lb-ft
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
360 Nm
266 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
1,355 kg
2,987 lb
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
1,430 kg
3,153 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
272 km/h
169 mph
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
PorscheBoxster (987)S 3.45.4 s
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V65.4 s

Although Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 has more power, Porsche Boxster (987) S 3.4 is quicker from 0-100 km/h.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
9.7 L/100 km
24.2 mpg US
29.1 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 and Porsche Boxster (987) S 3.4: 0.9 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
218 hp/t
162 kW/t
4.6 kg/hp
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
213 hp/t
159 kW/t
4.7 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
PorscheBoxster (987)S 3.4
604 km
375 mi
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
722 km
448 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (987)S 3.4
295 hp
220 kW
5.4 s
272 km/h
169 mph
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
305 hp
227 kW
5.4 s
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
PorscheBoxster (987)S 3.4
Power
295 hp
220 kW
0-100 km/h5.4 s
Top speed
272 km/h
169 mph
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,329 mm
170.4 in
Height
1,292 mm
50.9 in
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
305 hp
227 kW
0-100 km/h5.4 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
208 L
7.3 cu ft
Length
4,107 mm
161.7 in
Height
1,298 mm
51.1 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
PorscheBoxster (987)S 3.4
Power
295 hp
220 kW
0-100 km/h5.4 s
Top speed
272 km/h
169 mph
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
305 hp
227 kW
0-100 km/h5.4 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
9.7 L/100 km
24.2 mpg US
29.1 mpg UK

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
PorscheBoxster (987)S 3.4
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
5.4 s
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
5.4 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
PorscheBoxster (987)S 3.4
218 hp/t
162 kW/t
4.6 kg/hp
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
213 hp/t
159 kW/t
4.7 kg/hp
9.7 L/100 km
24.2 mpg US
29.1 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
295 hp
220 kW
305 hp
227 kW
Torque
340 Nm
251 lb-ft
360 Nm
266 lb-ft
Acceleration
5.4 s
5.4 s
Top speed
272 km/h
169 mph
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Lightness
1,355 kg
2,987 lb
1,430 kg
3,153 lb
Fuel consumption
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,329 mm
170.4 in
Height
1,292 mm
50.9 in
Doors/seats
2 doors
2 seats
Trunk
208 L
7.3 cu ft
Length
4,107 mm
161.7 in
Height
1,298 mm
51.1 in
Range score
604 km
375 mi
722 km
448 mi
CO2 score
254 g/km
-
Trunk score
130 L
4.6 cu ft
208 L
7.3 cu ft
Power-to-weight score
218 hp/t
162 kW/t
4.6 kg/hp
213 hp/t
159 kW/t
4.7 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehiclePorsche Boxster (987) S 3.4Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6
Consumption10.6 L/100 km22.2 mpg US26.6 mpg UK9.7 L/100 km24.2 mpg US29.1 mpg UK
Cost / 100 km18.55 LC100 km16.97 LC100 km
Cost / 100 mi29.85 LC100 mi27.32 LC100 mi
Annual fuel used1,590 L420 US gal350 UK gal1,455 L384 US gal320 UK gal
Annual fuel cost2,783 LC/year2,546 LC/year

Head-to-head comparisons

Porsche Boxster (987) S 3.4

  • Is 75 kg lighter
  • Has 2 km/h (1 mph) higher top speed
  • Has 4 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Best power-to-weight ratio

Cons

  • Lowest power
  • Highest combined fuel consumption
  • Smallest trunk

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6

  • Has 10 hp more
  • Has 20 Nm more
  • Uses 0.9 L/100 km less fuel
  • Has 118 km (73 mi) more estimated range
  • Has 78 L more trunk volume

Pros

  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche Boxster (987) S 3.4
Mercedes-Benz SLK (R171) SLK 350 V6
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2 vehicles selected

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