Car comparison

Mercedes-Benz SLK (R171) · Facelift 2008 SLK 350 V6vsPorsche Boxster (987) · Facelift 2009 2.9

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 ccGasolineRWDManualNaturally aspiratedRoadster2008-2011
VS

Porsche Boxster (987) · Facelift 2009

2.9

255 hp2893 ccGasolineRWDAutomaticNaturally aspiratedRoadster2009-2012

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
    270 km/h
    168 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
  • Best estimated range
    722 km
    448 mi
  • Largest trunk
    208 L
  • Best overall score
    55/100
  • Best performance score
    67/100
  • Best practicality score
    29/100

Porsche Boxster (987) Facelift 2009 2.9

  • Lightest
    1,365 kg
    3,009 lb
  • Lowest combined fuel consumption
    9.1 L/100 km
    25.8 mpg US
    31.0 mpg UK
  • Lowest city consumption
    13.6 L/100 km
    17.3 mpg US
    20.8 mpg UK
  • Lowest highway consumption
    6.5 L/100 km
    36.2 mpg US
    43.5 mpg UK
  • Best economy score
    82/100

Specification comparison

Specification comparison
ModelMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)Facelift 20092.9
Power
305hp227kW
255hp190kW
Torque
360Nm266lb-ft
290Nm214lb-ft
Curb weight
1,430kg3,153lb
1,365kg3,009lb
Gross weight
1,800kg3,968lb
1,670kg3,682lb
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Calculated
261 km/h
162 mph
To 99% top speed
70.5s99% target: 267 km/h / 166 mph
Calculated
89.6s99% target: 258 km/h / 161 mph
Calculated
0-100 km/h
5.4s
5.8s
0-200 km/h
17.9s
Calculated
22.1s
0-60 mph
5.1s
Calculated
5.5s
Calculated
Fuel consumption
9.7L/100 km24.2mpg US29.1mpg UK
9.1L/100 km25.8mpg US31.0mpg UK
Fuel consumption city
14.5L/100 km16.2mpg US19.5mpg UK
13.6L/100 km17.3mpg US20.8mpg UK
Fuel consumption highway
7L/100 km33.6mpg US40.4mpg UK
6.5L/100 km36.2mpg US43.5mpg UK
Quarter mile
13.4s
Calculated
13.9s
Calculated
Power-to-weight
213hp/t159kW/t97hp/1000 lb
Calculated
187hp/t139kW/t85hp/1000 lb
Calculated
Torque-to-weight
252Nm/t168lb-ft/ton
Calculated
212Nm/t142lb-ft/ton
Calculated
Estimated range
722km448mi
Calculated
714km444mi
Calculated
Displacement
3,498cc213cu in
2,893cc177cu in
Length
4,107mm162in
4,342mm171in
Width
1,788mm70in
1,801mm71in
Height
1,298mm51in
1,292mm51in
Wheelbase
2,430mm96in
2,415mm95in
Front track
1,526mm60in
1,490mm59in
Rear track
1,549mm61in
1,534mm60in
Ground clearance-
127mm5in
Trunk volume
208L
130L
Doors
2
2
Seats
2
2
Fuel tank
70L
65L
CO2 emissions-
214g/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) Facelift 2009 2.9PowerTorque
  • Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6: Power / Torque
  • Porsche Boxster (987) Facelift 2009 2.9: 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)Facelift 20092.97,200 rpm4,400-6,000 rpm7,500 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)Facelift 20092.9
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.5 s
0-100 km/h
0-62 mph
5.4 s
5.8 s
0-200 km/h
0-124 mph
17.9 s
22.1 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Limited
261 km/h
162 mph
Drag race simulation
60 ft
18 m
2.3 s
2.2 s
330 ft
101 m
5.9 s
6.0 s
1/8 mile
201 m
8.9 s
9.1 s
1000 ft
305 m
11.4 s
11.7 s
1/4 mile
402 m
13.4 s
13.9 s
Trap speed
1/4 mile
402 m
175 km/h
109 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)Facelift 20092.9
255 hp
190 kW

Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 has 50 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) Facelift 2008 SLK 350 V6: 50 hp (37 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)Facelift 20092.9
290 Nm
214 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)Facelift 20092.9
1,365 kg
3,009 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
270 km/h168 mph
Restricted
250 km/h155 mph
PorscheBoxster (987)Facelift 20092.9
261 km/h
162 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)Facelift 20092.95.8 s

The biggest 0-100 km/h difference is between Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6 and Porsche Boxster (987) Facelift 2009 2.9: 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
Mercedes-BenzSLK (R171)Facelift 2008SLK 350 V6
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
PorscheBoxster (987)Facelift 20092.9
9.1 L/100 km
25.8 mpg US
31.0 mpg UK

The biggest fuel consumption difference is between Porsche Boxster (987) Facelift 2009 2.9 and Mercedes-Benz SLK (R171) Facelift 2008 SLK 350 V6: 0.6 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)Facelift 20092.9
187 hp/t
139 kW/t
5.4 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
722 km
448 mi
PorscheBoxster (987)Facelift 20092.9
714 km
444 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
270 km/h168 mph
Restricted
250 km/h155 mph
PorscheBoxster (987)Facelift 20092.9
255 hp
190 kW
5.8 s
261 km/h
162 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
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
PorscheBoxster (987)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.8 s
Top speed
261 km/h
162 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

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
270 km/h168 mph
Restricted
250 km/h155 mph
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
PorscheBoxster (987)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.8 s
Top speed
261 km/h
162 mph
9.1 L/100 km
25.8 mpg US
31.0 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
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
5.4 s
PorscheBoxster (987)Facelift 20092.9
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
5.8 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
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
PorscheBoxster (987)Facelift 20092.9
187 hp/t
139 kW/t
5.4 kg/hp
9.1 L/100 km
25.8 mpg US
31.0 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleMercedes-BenzSLK (R171)Facelift 2008SLK 350 V6PorscheBoxster (987)Facelift 20092.9
Power
305 hp
227 kW
255 hp
190 kW
Torque
360 Nm
266 lb-ft
290 Nm
214 lb-ft
Acceleration
5.4 s
5.8 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
261 km/h
162 mph
Lightness
1,430 kg
3,153 lb
1,365 kg
3,009 lb
Fuel consumption
9.7 L/100 km
24.2 mpg US
29.1 mpg UK
9.1 L/100 km
25.8 mpg US
31.0 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
4,342 mm
170.9 in
Height
1,292 mm
50.9 in
Range score
722 km
448 mi
714 km
444 mi
CO2 score
-
214 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
187 hp/t
139 kW/t
5.4 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) Facelift 2009 2.9
Consumption9.7 L/100 km24.2 mpg US29.1 mpg UK9.1 L/100 km25.8 mpg US31 mpg UK
Cost / 100 km16.97 LC100 km15.92 LC100 km
Cost / 100 mi27.32 LC100 mi25.63 LC100 mi
Annual fuel used1,455 L384 US gal320 UK gal1,365 L361 US gal300 UK gal
Annual fuel cost2,546 LC/year2,389 LC/year

Head-to-head comparisons

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

  • Has 50 hp more
  • Has 70 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Has 9 km/h (6 mph) higher top speed
  • Has 26 hp/t better power-to-weight
  • Has 7 km (5 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
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest

Choose cars to compare

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

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