Car comparison

Porsche Boxster (987) · Facelift 2009 2.9vsMercedes-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) · Facelift 2009

2.9

255 hp2893 ccGasolineRWDManualNaturally aspiratedRoadster2009-2012
VS

Mercedes-Benz SLK (R171)

SLK 350 V6

272 hp3498 ccGasolineRWDManualNaturally aspiratedRoadster2004-2007

Comparison overview

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

Best choices

Mercedes-Benz SLK (R171) SLK 350 V6

  • Quickest 0-100 km/h
    5.6 s
  • Most powerful
    272 hp
    203 kW
  • Highest torque
    350 Nm
    258 lb-ft
  • Best power-to-weight
    196 hp/t
    146 kW/t
    5.1 kg/hp
  • Largest trunk
    208 L
  • Best overall score
    52/100
  • Best performance score
    63/100
  • Best practicality score
    29/100

Porsche Boxster (987) Facelift 2009 2.9

  • Fastest top speed
    263 km/h
    163 mph
  • Lightest
    1,335 kg
    2,943 lb
  • Lowest combined fuel consumption
    9.4 L/100 km
    25.0 mpg US
    30.1 mpg UK
  • Lowest city consumption
    13.8 L/100 km
    17.0 mpg US
    20.5 mpg UK
  • Lowest highway consumption
    6.9 L/100 km
    34.1 mpg US
    40.9 mpg UK
  • Best estimated range
    691 km
    430 mi
  • Best economy score
    82/100

Specification comparison

Specification comparison
ModelPorscheBoxster (987)Facelift 20092.9Mercedes-BenzSLK (R171)SLK 350 V6
Power
255hp190kW
272hp203kW
Torque
290Nm214lb-ft
350Nm258lb-ft
Curb weight
1,335kg2,943lb
1,390kg3,064lb
Gross weight
1,635kg3,605lb
1,780kg3,924lb
Top speed
263 km/h
163 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
92.4s99% target: 260 km/h / 162 mph
Calculated
70.5s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.9s
5.6s
0-200 km/h
22.3s
19.4s
Calculated
0-60 mph
5.6s
Calculated
5.3s
Calculated
Fuel consumption
9.4L/100 km25mpg US30.1mpg UK
10.6L/100 km22.2mpg US26.6mpg UK
Fuel consumption city
13.8L/100 km17mpg US20.5mpg UK
15.5L/100 km15.2mpg US18.2mpg UK
Fuel consumption highway
6.9L/100 km34.1mpg US40.9mpg UK
7.8L/100 km30.2mpg US36.2mpg UK
Quarter mile
14.0s
Calculated
13.7s
Calculated
Power-to-weight
191hp/t142kW/t87hp/1000 lb
Calculated
196hp/t146kW/t89hp/1000 lb
Calculated
Torque-to-weight
217Nm/t145lb-ft/ton
Calculated
252Nm/t168lb-ft/ton
Calculated
Estimated range
691km430mi
Calculated
660km410mi
Calculated
Displacement
2,893cc177cu in
3,498cc213cu in
Length
4,342mm171in
4,089mm161in
Width
1,801mm71in
1,788mm70in
Height
1,292mm51in
1,298mm51in
Wheelbase
2,415mm95in
2,430mm96in
Front track
1,490mm59in
1,526mm60in
Rear track
1,534mm60in
1,549mm61in
Ground clearance
127mm5in
-
Trunk volume
130L
208L
Doors
2
2
Seats
2
2
Fuel tank
65L
70L
CO2 emissions
221g/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) Facelift 2009 2.9Mercedes-Benz SLK (R171) SLK 350 V6PowerTorque
  • Porsche Boxster (987) Facelift 2009 2.9: Power / Torque
  • Mercedes-Benz SLK (R171) SLK 350 V6: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (987)Facelift 20092.97,200 rpm4,400-6,000 rpm7,500 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)Facelift 20092.9Mercedes-BenzSLK (R171)SLK 350 V6
Acceleration checkpoints
0-60 mph
0-97 km/h
5.6 s
5.3 s
0-100 km/h
0-62 mph
5.9 s
5.6 s
0-200 km/h
0-124 mph
22.3 s
19.4 s
Top speed
263 km/h
163 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.3 s
2.3 s
330 ft
101 m
6.0 s
6.0 s
1/8 mile
201 m
9.1 s
9.0 s
1000 ft
305 m
11.8 s
11.6 s
1/4 mile
402 m
14.0 s
13.7 s
Trap speed
1/4 mile
402 m
164 km/h
102 mph
171 km/h
106 mph

Power comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
255 hp
190 kW
Mercedes-BenzSLK (R171)SLK 350 V6
272 hp
203 kW

Mercedes-Benz SLK (R171) SLK 350 V6 has 17 hp more than Porsche Boxster (987) Facelift 2009 2.9.

The biggest power difference is between Porsche Boxster (987) Facelift 2009 2.9 and Mercedes-Benz SLK (R171) SLK 350 V6: 17 hp (13 kW).

Torque comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
290 Nm
214 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)Facelift 20092.9
1,335 kg
2,943 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)Facelift 20092.9
263 km/h
163 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)Facelift 20092.95.9 s
Mercedes-BenzSLK (R171)SLK 350 V65.6 s

The biggest 0-100 km/h difference is between Mercedes-Benz SLK (R171) SLK 350 V6 and Porsche Boxster (987) Facelift 2009 2.9: 0.3 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)Facelift 20092.9
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R171)SLK 350 V6
10.6 L/100 km
22.2 mpg US
26.6 mpg UK

The biggest fuel consumption difference is between Porsche Boxster (987) Facelift 2009 2.9 and Mercedes-Benz SLK (R171) SLK 350 V6: 1.2 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)Facelift 20092.9
191 hp/t
142 kW/t
5.2 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)Facelift 20092.9
691 km
430 mi
Mercedes-BenzSLK (R171)SLK 350 V6
660 km
410 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (987)Facelift 20092.9
255 hp
190 kW
5.9 s
263 km/h
163 mph
Mercedes-BenzSLK (R171)SLK 350 V6
272 hp
203 kW
5.6 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)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.9 s
Top speed
263 km/h
163 mph
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 in
Height
1,292 mm
50.9 in
Mercedes-BenzSLK (R171)SLK 350 V6
Power
272 hp
203 kW
0-100 km/h5.6 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)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.9 s
Top speed
263 km/h
163 mph
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R171)SLK 350 V6
Power
272 hp
203 kW
0-100 km/h5.6 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
10.6 L/100 km
22.2 mpg US
26.6 mpg UK

Porsche Boxster (987) Facelift 2009 2.9 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)Facelift 20092.9
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
5.9 s
Mercedes-BenzSLK (R171)SLK 350 V6
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
5.6 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)Facelift 20092.9
191 hp/t
142 kW/t
5.2 kg/hp
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R171)SLK 350 V6
196 hp/t
146 kW/t
5.1 kg/hp
10.6 L/100 km
22.2 mpg US
26.6 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)Facelift 20092.9Mercedes-BenzSLK (R171)SLK 350 V6
Power
255 hp
190 kW
272 hp
203 kW
Torque
290 Nm
214 lb-ft
350 Nm
258 lb-ft
Acceleration
5.9 s
5.6 s
Top speed
263 km/h
163 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,335 kg
2,943 lb
1,390 kg
3,064 lb
Fuel consumption
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
10.6 L/100 km
22.2 mpg US
26.6 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 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
691 km
430 mi
660 km
410 mi
CO2 score
221 g/km
-
Trunk score
130 L
4.6 cu ft
208 L
7.3 cu ft
Power-to-weight score
191 hp/t
142 kW/t
5.2 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) Facelift 2009 2.9Mercedes-Benz SLK (R171) SLK 350 V6
Consumption9.4 L/100 km25 mpg US30.1 mpg UK10.6 L/100 km22.2 mpg US26.6 mpg UK
Cost / 100 km16.45 LC100 km18.55 LC100 km
Cost / 100 mi26.47 LC100 mi29.85 LC100 mi
Annual fuel used1,410 L372 US gal310 UK gal1,590 L420 US gal350 UK gal
Annual fuel cost2,468 LC/year2,783 LC/year

Head-to-head comparisons

Porsche Boxster (987) Facelift 2009 2.9

  • Is 55 kg lighter
  • Has 3 km/h (2 mph) higher top speed
  • Uses 1.2 L/100 km less fuel
  • Has 31 km (19 mi) more estimated range

Pros

  • Highest top speed
  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range

Cons

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

Mercedes-Benz SLK (R171) SLK 350 V6

  • Has 17 hp more
  • Has 60 Nm more
  • Is 0.3 s quicker from 0-100 km/h
  • Has 5 hp/t better power-to-weight
  • Has 78 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche Boxster (987) 2.9
Mercedes-Benz SLK (R171) SLK 350 V6
Compare selected cars
2 vehicles selected

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