Car comparison

Porsche Boxster (987) · Facelift 2009 S 3.4vsMercedes-Benz SLK (R172) SLK 350 V6

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

New comparison

Porsche Boxster (987) · Facelift 2009

S 3.4

310 hp3436 ccGasolineRWDAutomaticNaturally aspiratedRoadster2009-2012
VS

Mercedes-Benz SLK (R172)

SLK 350 V6

306 hp3498 ccGasolineRWDAutomaticNaturally aspiratedRoadster2011-2015

Comparison overview

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

Best choices

Mercedes-Benz SLK (R172) SLK 350 V6

  • Highest torque
    370 Nm
    273 lb-ft
  • Lowest combined fuel consumption
    7.1 L/100 km
    33.1 mpg US
    39.8 mpg UK
  • Lowest city consumption
    9.9 L/100 km
    23.8 mpg US
    28.5 mpg UK
  • Lowest highway consumption
    5.5 L/100 km
    42.8 mpg US
    51.4 mpg UK
  • Lowest CO2 emissions
    167 g/km
  • Best estimated range
    845 km
    525 mi
  • Largest trunk
    225 L
  • Best economy score
    88/100
  • Best practicality score
    29/100

Porsche Boxster (987) Facelift 2009 S 3.4

  • Quickest 0-100 km/h
    5.2 s
  • Fastest top speed
    272 km/h
    169 mph
  • Most powerful
    310 hp
    231 kW
  • Lightest
    1,380 kg
    3,042 lb
  • Best power-to-weight
    225 hp/t
    168 kW/t
    4.5 kg/hp
  • Best overall score
    55/100
  • Best performance score
    68/100

Specification comparison

Specification comparison
ModelPorscheBoxster (987)Facelift 2009S 3.4Mercedes-BenzSLK (R172)SLK 350 V6
Power
310hp231kW
306hp228kW
Torque
360Nm266lb-ft
370Nm273lb-ft
Curb weight
1,380kg3,042lb
1,465kg3,230lb
Gross weight
1,675kg3,693lb
1,855kg4,090lb
Top speed
272 km/h
169 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
78.5s99% target: 269 km/h / 167 mph
Calculated
72.3s99% target: 262 km/h / 163 mph
Calculated
0-100 km/h
5.2s
5.6s
0-200 km/h
18.2s
19.0s
Calculated
0-60 mph
4.9s
Calculated
5.3s
Calculated
Fuel consumption
9.4L/100 km25mpg US30.1mpg UK
7.1L/100 km33.1mpg US39.8mpg UK
Fuel consumption city
14.1L/100 km16.7mpg US20.0mpg UK
9.9L/100 km23.8mpg US28.5mpg UK
Fuel consumption highway
6.6L/100 km35.6mpg US42.8mpg UK
5.5L/100 km42.8mpg US51.4mpg UK
Quarter mile
13.3s
Calculated
13.7s
Calculated
Power-to-weight
225hp/t168kW/t102hp/1000 lb
Calculated
209hp/t156kW/t95hp/1000 lb
Calculated
Torque-to-weight
261Nm/t175lb-ft/ton
Calculated
253Nm/t169lb-ft/ton
Calculated
Estimated range
691km430mi
Calculated
845km525mi
Calculated
Displacement
3,436cc210cu in
3,498cc213cu in
Length
4,342mm171in
4,134mm163in
Width
1,801mm71in
1,810mm71in
Height
1,294mm51in
1,301mm51in
Wheelbase
2,415mm95in
2,430mm96in
Front track
1,486mm59in
1,559mm61in
Rear track
1,528mm60in
1,565mm62in
Ground clearance
123mm5in
-
Trunk volume
130L
225L
Max trunk volume-
335L
Doors
2
2
Seats
2
2
Fuel tank
65L
60L
CO2 emissions
221g/km
167g/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 S 3.4Mercedes-Benz SLK (R172) SLK 350 V6PowerTorque
  • Porsche Boxster (987) Facelift 2009 S 3.4: Power / Torque
  • Mercedes-Benz SLK (R172) SLK 350 V6: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (987)Facelift 2009S 3.47,200 rpm4,750 rpm7,500 rpm
Mercedes-BenzSLK (R172)SLK 350 V66,500 rpm3,500-5,250 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (987)Facelift 2009S 3.4Mercedes-BenzSLK (R172)SLK 350 V6
Acceleration checkpoints
0-60 mph
0-97 km/h
4.9 s
5.3 s
0-100 km/h
0-62 mph
5.2 s
5.6 s
0-200 km/h
0-124 mph
18.2 s
19.0 s
Top speed
272 km/h
169 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.2 s
2.3 s
330 ft
101 m
5.8 s
6.0 s
1/8 mile
201 m
8.7 s
9.0 s
1000 ft
305 m
11.2 s
11.5 s
1/4 mile
402 m
13.3 s
13.7 s
Trap speed
1/4 mile
402 m
174 km/h
108 mph
172 km/h
107 mph

Power comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 2009S 3.4
310 hp
231 kW
Mercedes-BenzSLK (R172)SLK 350 V6
306 hp
228 kW

Porsche Boxster (987) Facelift 2009 S 3.4 has 4 hp more than Mercedes-Benz SLK (R172) SLK 350 V6.

The biggest power difference is between Mercedes-Benz SLK (R172) SLK 350 V6 and Porsche Boxster (987) Facelift 2009 S 3.4: 4 hp (3 kW).

Torque comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 2009S 3.4
360 Nm
266 lb-ft
Mercedes-BenzSLK (R172)SLK 350 V6
370 Nm
273 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 2009S 3.4
1,380 kg
3,042 lb
Mercedes-BenzSLK (R172)SLK 350 V6
1,465 kg
3,230 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 2009S 3.4
272 km/h
169 mph
Mercedes-BenzSLK (R172)SLK 350 V6
Unrestricted
265 km/h165 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 2009S 3.45.2 s
Mercedes-BenzSLK (R172)SLK 350 V65.6 s

The biggest 0-100 km/h difference is between Porsche Boxster (987) Facelift 2009 S 3.4 and Mercedes-Benz SLK (R172) SLK 350 V6: 0.4 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 2009S 3.4
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R172)SLK 350 V6
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SLK (R172) SLK 350 V6 and Porsche Boxster (987) Facelift 2009 S 3.4: 2.3 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 2009S 3.4
225 hp/t
168 kW/t
4.5 kg/hp
Mercedes-BenzSLK (R172)SLK 350 V6
209 hp/t
156 kW/t
4.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 2009S 3.4
691 km
430 mi
Mercedes-BenzSLK (R172)SLK 350 V6
845 km
525 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (987)Facelift 2009S 3.4
310 hp
231 kW
5.2 s
272 km/h
169 mph
Mercedes-BenzSLK (R172)SLK 350 V6
306 hp
228 kW
5.6 s
Unrestricted
265 km/h165 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 2009S 3.4
Power
310 hp
231 kW
0-100 km/h5.2 s
Top speed
272 km/h
169 mph
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 in
Height
1,294 mm
50.9 in
Mercedes-BenzSLK (R172)SLK 350 V6
Power
306 hp
228 kW
0-100 km/h5.6 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
225 L
7.9 cu ft
Length
4,134 mm
162.8 in
Height
1,301 mm
51.2 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 2009S 3.4
Power
310 hp
231 kW
0-100 km/h5.2 s
Top speed
272 km/h
169 mph
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R172)SLK 350 V6
Power
306 hp
228 kW
0-100 km/h5.6 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

Mercedes-Benz SLK (R172) 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)Facelift 2009S 3.4
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
5.2 s
Mercedes-BenzSLK (R172)SLK 350 V6
7.1 L/100 km
33.1 mpg US
39.8 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 2009S 3.4
225 hp/t
168 kW/t
4.5 kg/hp
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Mercedes-BenzSLK (R172)SLK 350 V6
209 hp/t
156 kW/t
4.8 kg/hp
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)Facelift 2009S 3.4Mercedes-BenzSLK (R172)SLK 350 V6
Power
310 hp
231 kW
306 hp
228 kW
Torque
360 Nm
266 lb-ft
370 Nm
273 lb-ft
Acceleration
5.2 s
5.6 s
Top speed
272 km/h
169 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Lightness
1,380 kg
3,042 lb
1,465 kg
3,230 lb
Fuel consumption
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
7.1 L/100 km
33.1 mpg US
39.8 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 in
Height
1,294 mm
50.9 in
Doors/seats
2 doors
2 seats
Trunk
225 L
7.9 cu ft
Length
4,134 mm
162.8 in
Height
1,301 mm
51.2 in
Range score
691 km
430 mi
845 km
525 mi
CO2 score
221 g/km
167 g/km
Trunk score
130 L
4.6 cu ft
225 L
7.9 cu ft
Power-to-weight score
225 hp/t
168 kW/t
4.5 kg/hp
209 hp/t
156 kW/t
4.8 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 S 3.4Mercedes-Benz SLK (R172) SLK 350 V6
Consumption9.4 L/100 km25 mpg US30.1 mpg UK7.1 L/100 km33.1 mpg US39.8 mpg UK
Cost / 100 km16.45 LC100 km12.42 LC100 km
Cost / 100 mi26.47 LC100 mi20.00 LC100 mi
Annual fuel used1,410 L372 US gal310 UK gal1,065 L281 US gal234 UK gal
Annual fuel cost2,468 LC/year1,864 LC/year

Head-to-head comparisons

Porsche Boxster (987) Facelift 2009 S 3.4

  • Has 4 hp more
  • Is 85 kg lighter
  • Is 0.4 s quicker from 0-100 km/h
  • Has 7 km/h (4 mph) higher top speed
  • Has 16 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
  • Highest CO2 emissions

Mercedes-Benz SLK (R172) SLK 350 V6

  • Has 10 Nm more
  • Uses 2.3 L/100 km less fuel
  • Has 154 km (95 mi) more estimated range
  • Has 95 L more trunk volume
  • Emits 54 g/km less CO2

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 (R172) SLK 350 V6
Compare selected cars
2 vehicles selected

Popular comparisons

S 3.4
S 3.4
VS
PorscheBoxster (987)Facelift 2009S 3.4vsPorscheBoxster (981)S 3.4
SLK 350 V6
SLK 350 V6
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
S 3.4
S 3.4
VS
PorscheBoxster (987)Facelift 2009S 3.4vsPorscheBoxster (987)S 3.4
SLK 350 V6
SLK 350 V6
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsMercedes-BenzSLK (R171)SLK 350 V6
S 3.4
S 3.2
VS
PorscheBoxster (987)Facelift 2009S 3.4vsPorscheBoxster (986)S 3.2
SLK 350 V6
AMG SLK 32 V6
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsMercedes-BenzSLK (R170)Facelift 2000AMG SLK 32 V6
S 3.4
35i
VS
PorscheBoxster (987)Facelift 2009S 3.4vsBMWZ4 (E89)35i
SLK 350 V6
SLK 230 Kompressor
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsMercedes-BenzSLK (R170)SLK 230 Kompressor
S 3.4
3.7 V6
VS
PorscheBoxster (987)Facelift 2009S 3.4vsNissan370Z Roadster3.7 V6
SLK 350 V6
SL 400 V6
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsMercedes-BenzSL (R231)Facelift 2016SL 400 V6
S 3.4
2.5 TFSI
VS
PorscheBoxster (987)Facelift 2009S 3.4vsAUDITT RS Roadster (8J)2.5 TFSI
SLK 350 V6
3.7 V6
VS
Mercedes-BenzSLK (R172)SLK 350 V6vsNissan370Z RoadsterFacelift 20123.7 V6
Porsche Boxster (987) · Facelift 2009 S 3.4 vs Mercedes-Benz SLK (R172) SLK 350 V6 - car comparison - FastVsFaster