Car comparison

Porsche Boxster (987) S 3.4vsMercedes-Benz SLK (R171) 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)

SLK 350 V6

272 hp3498 ccGasolineRWDAutomaticNaturally aspiratedRoadster2004-2007

Comparison overview

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

Best choices

Porsche Boxster (987) S 3.4

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    272 km/h
    169 mph
  • Most powerful
    295 hp
    220 kW
  • Lightest
    1,355 kg
    2,987 lb
  • Best power-to-weight
    218 hp/t
    162 kW/t
    4.6 kg/hp
  • Lowest highway consumption
    7.8 L/100 km
    30.2 mpg US
    36.2 mpg UK
  • Best overall score
    53/100
  • Best performance score
    66/100

Mercedes-Benz SLK (R171) SLK 350 V6

  • Highest torque
    350 Nm
    258 lb-ft
  • Lowest combined fuel consumption
    10.1 L/100 km
    23.3 mpg US
    28.0 mpg UK
  • Lowest city consumption
    14.2 L/100 km
    16.6 mpg US
    19.9 mpg UK
  • Best estimated range
    693 km
    431 mi
  • Largest trunk
    208 L
  • Best economy score
    80/100
  • Best practicality score
    29/100

Specification comparison

Specification comparison
ModelPorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)SLK 350 V6
Power
295hp220kW
272hp203kW
Torque
340Nm251lb-ft
350Nm258lb-ft
Curb weight
1,355kg2,987lb
1,390kg3,064lb
Gross weight
1,630kg3,594lb
1,780kg3,924lb
Top speed
272 km/h
169 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
80.6s99% target: 269 km/h / 167 mph
Calculated
69.2s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.4s
5.5s
0-200 km/h
18.8s
19.1s
Calculated
0-60 mph
5.1s
Calculated
5.2s
Calculated
Fuel consumption
10.6L/100 km22.2mpg US26.6mpg UK
10.1L/100 km23.3mpg US28.0mpg UK
Fuel consumption city
15.3L/100 km15.4mpg US18.5mpg UK
14.2L/100 km16.6mpg US19.9mpg UK
Fuel consumption highway
7.8L/100 km30.2mpg US36.2mpg UK
7.8L/100 km30.2mpg US36.2mpg UK
Quarter mile
13.5s
Calculated
13.6s
Calculated
Power-to-weight
218hp/t162kW/t99hp/1000 lb
Calculated
196hp/t146kW/t89hp/1000 lb
Calculated
Torque-to-weight
251Nm/t168lb-ft/ton
Calculated
252Nm/t168lb-ft/ton
Calculated
Estimated range
604km375mi
Calculated
693km431mi
Calculated
Displacement
3,387cc207cu in
3,498cc213cu in
Length
4,329mm170in
4,089mm161in
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) SLK 350 V6PowerTorque
  • Porsche Boxster (987) S 3.4: Power / Torque
  • Mercedes-Benz SLK (R171) 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)SLK 350 V66,000 rpm2,400-5,000 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)SLK 350 V6
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.2 s
0-100 km/h
0-62 mph
5.4 s
5.5 s
0-200 km/h
0-124 mph
18.8 s
19.1 s
Top speed
272 km/h
169 mph
Unrestricted
260 km/h162 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
6.0 s
1/8 mile
201 m
8.8 s
8.9 s
1000 ft
305 m
11.4 s
11.5 s
1/4 mile
402 m
13.5 s
13.6 s
Trap speed
1/4 mile
402 m
172 km/h
107 mph
172 km/h
107 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)SLK 350 V6
272 hp
203 kW

Porsche Boxster (987) S 3.4 has 23 hp more than Mercedes-Benz SLK (R171) SLK 350 V6.

The biggest power difference is between Mercedes-Benz SLK (R171) SLK 350 V6 and Porsche Boxster (987) S 3.4: 23 hp (17 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)SLK 350 V6
350 Nm
258 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)SLK 350 V6
1,390 kg
3,064 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)SLK 350 V6
Unrestricted
260 km/h162 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)SLK 350 V65.5 s

The biggest 0-100 km/h difference is between Porsche Boxster (987) S 3.4 and Mercedes-Benz SLK (R171) SLK 350 V6: 0.1 s.

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)SLK 350 V6
10.1 L/100 km
23.3 mpg US
28.0 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SLK (R171) SLK 350 V6 and Porsche Boxster (987) S 3.4: 0.5 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)SLK 350 V6
196 hp/t
146 kW/t
5.1 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)SLK 350 V6
693 km
431 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)SLK 350 V6
272 hp
203 kW
5.5 s
Unrestricted
260 km/h162 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)SLK 350 V6
Power
272 hp
203 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
208 L
7.3 cu ft
Length
4,089 mm
161.0 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)SLK 350 V6
Power
272 hp
203 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
10.1 L/100 km
23.3 mpg US
28.0 mpg UK

Porsche Boxster (987) S 3.4 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)SLK 350 V6
10.1 L/100 km
23.3 mpg US
28.0 mpg UK
5.5 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)SLK 350 V6
196 hp/t
146 kW/t
5.1 kg/hp
10.1 L/100 km
23.3 mpg US
28.0 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)S 3.4Mercedes-BenzSLK (R171)SLK 350 V6
Power
295 hp
220 kW
272 hp
203 kW
Torque
340 Nm
251 lb-ft
350 Nm
258 lb-ft
Acceleration
5.4 s
5.5 s
Top speed
272 km/h
169 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,355 kg
2,987 lb
1,390 kg
3,064 lb
Fuel consumption
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
10.1 L/100 km
23.3 mpg US
28.0 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
4,089 mm
161.0 in
Height
1,298 mm
51.1 in
Range score
604 km
375 mi
693 km
431 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
196 hp/t
146 kW/t
5.1 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) SLK 350 V6
Consumption10.6 L/100 km22.2 mpg US26.6 mpg UK10.1 L/100 km23.3 mpg US28 mpg UK
Cost / 100 km18.55 LC100 km17.68 LC100 km
Cost / 100 mi29.85 LC100 mi28.45 LC100 mi
Annual fuel used1,590 L420 US gal350 UK gal1,515 L400 US gal333 UK gal
Annual fuel cost2,783 LC/year2,651 LC/year

Head-to-head comparisons

Porsche Boxster (987) S 3.4

  • Has 23 hp more
  • Is 35 kg lighter
  • Is 0.1 s quicker from 0-100 km/h
  • Has 12 km/h (7 mph) higher top speed
  • Has 22 hp/t better power-to-weight

Pros

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

Cons

  • Highest combined fuel consumption
  • Smallest trunk

Mercedes-Benz SLK (R171) SLK 350 V6

  • Has 10 Nm more
  • Uses 0.5 L/100 km less fuel
  • Has 89 km (55 mi) more estimated range
  • Has 78 L more trunk volume

Pros

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

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • 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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