Car comparison

Mercedes-Benz SLK (R171) · Facelift 2008 SLK 350 V6vsPorsche Boxster (987) S 3.4

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

New comparison

Mercedes-Benz SLK (R171) · Facelift 2008

SLK 350 V6

305 hp3498 ccGasolineRWDAutomaticNaturally aspiratedRoadster2008-2011
VS

Porsche Boxster (987)

S 3.4

295 hp3387 ccGasolineRWDAutomaticNaturally aspiratedRoadster2006-2009

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

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    305 hp
    227 kW
  • Highest torque
    360 Nm
    266 lb-ft
  • Best power-to-weight
    213 hp/t
    159 kW/t
    4.7 kg/hp
  • Lowest combined fuel consumption
    9.0 L/100 km
    26.1 mpg US
    31.4 mpg UK
  • Lowest city consumption
    12.6 L/100 km
    18.7 mpg US
    22.4 mpg UK
  • Lowest highway consumption
    6.9 L/100 km
    34.1 mpg US
    40.9 mpg UK
  • Best estimated range
    778 km
    483 mi
  • Largest trunk
    208 L
  • Best overall score
    54/100
  • Best performance score
    66/100
  • Best economy score
    83/100
  • Best practicality score
    29/100

Specification comparison

Specification comparison
ModelMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)S 3.4
Power
305hp227kW
295hp220kW
Torque
360Nm266lb-ft
340Nm251lb-ft
Curb weight
1,430kg3,153lb
1,395kg3,075lb
Gross weight
1,800kg3,968lb
1,670kg3,682lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
264 km/h
164 mph
To 99% top speed
68.7s99% target: 262 km/h / 163 mph
Calculated
86.3s99% target: 261 km/h / 162 mph
Calculated
0-100 km/h
5.4s
6.1s
0-200 km/h
18.2s
Calculated
21.8s
0-60 mph
5.1s
Calculated
5.8s
Calculated
Fuel consumption
9L/100 km26.1mpg US31.4mpg UK
11L/100 km21.4mpg US25.7mpg UK
Fuel consumption city
12.6L/100 km18.7mpg US22.4mpg UK
16.3L/100 km14.4mpg US17.3mpg UK
Fuel consumption highway
6.9L/100 km34.1mpg US40.9mpg UK
7.9L/100 km29.8mpg US35.8mpg UK
Quarter mile
13.5s
Calculated
14.2s
Calculated
Power-to-weight
213hp/t159kW/t97hp/1000 lb
Calculated
211hp/t158kW/t96hp/1000 lb
Calculated
Torque-to-weight
252Nm/t168lb-ft/ton
Calculated
244Nm/t163lb-ft/ton
Calculated
Estimated range
778km483mi
Calculated
582km362mi
Calculated
Displacement
3,498cc213cu in
3,387cc207cu in
Length
4,107mm162in
4,329mm170in
Width
1,788mm70in
1,801mm71in
Height
1,298mm51in
1,292mm51in
Wheelbase
2,430mm96in
2,415mm95in
Front track
1,525mm60in
1,486mm59in
Rear track
1,550mm61in
1,528mm60in
Ground clearance-
121mm5in
Trunk volume
208L
130L
Doors
2
2
Seats
2
2
Fuel tank
70L
64L
CO2 emissions-
262g/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.

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6Porsche Boxster (987) S 3.4PowerTorque
  • Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6: Power / Torque
  • Porsche Boxster (987) S 3.4: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V66,500 rpm4,900 rpm6,750 rpm
PorscheBoxster (987)S 3.46,250 rpm4,400-6,000 rpm7,300 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)S 3.4
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.8 s
0-100 km/h
0-62 mph
5.4 s
6.1 s
0-200 km/h
0-124 mph
18.2 s
21.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Limited
264 km/h
164 mph
Drag race simulation
60 ft
18 m
2.3 s
2.4 s
330 ft
101 m
5.9 s
6.2 s
1/8 mile
201 m
8.9 s
9.3 s
1000 ft
305 m
11.4 s
11.9 s
1/4 mile
402 m
13.5 s
14.2 s
Trap speed
1/4 mile
402 m
174 km/h
108 mph
165 km/h
102 mph

Power comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
305 hp
227 kW
PorscheBoxster (987)S 3.4
295 hp
220 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
360 Nm
266 lb-ft
PorscheBoxster (987)S 3.4
340 Nm
251 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
1,430 kg
3,153 lb
PorscheBoxster (987)S 3.4
1,395 kg
3,075 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
PorscheBoxster (987)S 3.4
264 km/h
164 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V65.4 s
PorscheBoxster (987)S 3.46.1 s

The biggest 0-100 km/h difference is between Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 and Porsche Boxster (987) S 3.4: 0.7 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
9.0 L/100 km
26.1 mpg US
31.4 mpg UK
PorscheBoxster (987)S 3.4
11.0 L/100 km
21.4 mpg US
25.7 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: 2.0 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
213 hp/t
159 kW/t
4.7 kg/hp
PorscheBoxster (987)S 3.4
211 hp/t
158 kW/t
4.7 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
778 km
483 mi
PorscheBoxster (987)S 3.4
582 km
362 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
305 hp
227 kW
5.4 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
PorscheBoxster (987)S 3.4
295 hp
220 kW
6.1 s
264 km/h
164 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
305 hp
227 kW
0-100 km/h5.4 s
Top speed
Unrestricted
265 km/h165 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
PorscheBoxster (987)S 3.4
Power
295 hp
220 kW
0-100 km/h6.1 s
Top speed
264 km/h
164 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

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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
Power
305 hp
227 kW
0-100 km/h5.4 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
9.0 L/100 km
26.1 mpg US
31.4 mpg UK
PorscheBoxster (987)S 3.4
Power
295 hp
220 kW
0-100 km/h6.1 s
Top speed
264 km/h
164 mph
11.0 L/100 km
21.4 mpg US
25.7 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
9.0 L/100 km
26.1 mpg US
31.4 mpg UK
5.4 s
PorscheBoxster (987)S 3.4
11.0 L/100 km
21.4 mpg US
25.7 mpg UK
6.1 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
213 hp/t
159 kW/t
4.7 kg/hp
9.0 L/100 km
26.1 mpg US
31.4 mpg UK
PorscheBoxster (987)S 3.4
211 hp/t
158 kW/t
4.7 kg/hp
11.0 L/100 km
21.4 mpg US
25.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)S 3.4
Power
305 hp
227 kW
295 hp
220 kW
Torque
360 Nm
266 lb-ft
340 Nm
251 lb-ft
Acceleration
5.4 s
6.1 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
264 km/h
164 mph
Lightness
1,430 kg
3,153 lb
1,395 kg
3,075 lb
Fuel consumption
9.0 L/100 km
26.1 mpg US
31.4 mpg UK
11.0 L/100 km
21.4 mpg US
25.7 mpg UK
Practicality
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
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
Range score
778 km
483 mi
582 km
362 mi
CO2 score
-
262 g/km
Trunk score
208 L
7.3 cu ft
130 L
4.6 cu ft
Power-to-weight score
213 hp/t
159 kW/t
4.7 kg/hp
211 hp/t
158 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
VehicleMercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6Porsche Boxster (987) S 3.4
Consumption9 L/100 km26.1 mpg US31.4 mpg UK11 L/100 km21.4 mpg US25.7 mpg UK
Cost / 100 km15.75 LC100 km19.25 LC100 km
Cost / 100 mi25.35 LC100 mi30.98 LC100 mi
Annual fuel used1,350 L357 US gal297 UK gal1,650 L436 US gal363 UK gal
Annual fuel cost2,363 LC/year2,888 LC/year

Head-to-head comparisons

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

  • Has 10 hp more
  • Has 20 Nm more
  • Is 0.7 s quicker from 0-100 km/h
  • Has 1 km/h (1 mph) higher top speed
  • Uses 2.0 L/100 km less fuel
  • Has 2 hp/t better power-to-weight
  • Has 196 km (122 mi) more estimated range
  • Has 78 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest

Porsche Boxster (987) S 3.4

  • Is 35 kg lighter

Pros

  • Lightest

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

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