Comparison Porsche 911 Cabriolet (991 II) Turbo 3.8 (540 Hp) PDK & Audi S4 Avant (B9) 3.0 TFSI V6 (354 Hp) quattro Tiptronic & Mercedes-Benz CLK (C 208) CLK 230 Kompressor (193 Hp) 5G-TRONIC
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| Brand: | Porsche | Audi | Mercedes-Benz |
| Model: | 911 | S4 | CLK |
| Generation: | 911 Cabriolet (991 II) | S4 Avant (B9) | CLK (C 208) |
| Engine / modification: | Turbo 3.8 (540 Hp) PDK | 3.0 TFSI V6 (354 Hp) quattro Tiptronic | CLK 230 Kompressor (193 Hp) 5G-TRONIC |
| Production start: | 2015 year | 2016 year | 1997 year |
| Production end: | 2018 year | 1999 year | |
| Coupe type: | Cabriolet | Combi | Coupe |
| Num. of Doors: | 2 | 5 | 2 |
| Num. of seats: | 2+2 | 5 | 4 |
| Fuel consumption / economy - urban: | 12.1 l/100 km | 10.0-10.1 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.6 l/100 km | 6.1-6.3 l/100 km | |
| Fuel consumption / economy - combined: | 9.3 l/100 km | 7.5-7.6 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.31 | 0.31 |
| Fuel tank volume: | 68 l | 58 l | 62 l |
| Emission standard: | Euro 6 | EURO VI | Euro 3 |
| CO2 emissions: | 216 g/km | 171-175 g/km | |
| Power: | 540 hp | 354 hp | 193 hp |
| Max power in: | 6400 rpm. | 5400-6400 rpm. | 5300 rpm. |
| Maximum speed: | 320 km/h | 250 km/h | 231 km/h |
| Acceleration from 0 to 100 km/h: | 3.1 sec | 4.9 sec | 8.4 sec |
| Torque: | 710 Nm @ 2250-4000 rpm. | 500 Nm/1370-4500 rpm. | 280 Nm @ 2500-4800 rpm. |
| Model Engine: | MDA.BA | M 111.975 | |
| Engine position: | Rear, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3800 cm3 | 2995 cm3 | 2295 cm3 |
| Engine oil capacity: | 7.5 l | 5.5 l | |
| Coolant: | 8 l | ||
| Fuel System: | Direct injection | Direct injection | |
| Aspiration / Turbine: | BiTurbo | Turbocharging | |
| Position of cylinders: | Boxer | V engine | Inline |
| Valvetrain: | DOHC | DOHC | |
| Number of cylinders: | 6 | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 9.8 | 11.2 | 8.8 |
| Piston Stroke: | 77.5 mm | 89 mm | 88.4 mm |
| Cylinder Bore: | 102 mm | 84.5 mm | 90.9 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 PDK | 8 tiptronic | 5 G-TRONIC |
| Length: | 4507 mm | 4745 mm | 4567 mm |
| Width: | 1880 mm | 1842 mm | 1722 mm |
| Width including mirrors: | 1978 mm | 2022 mm | 1960 mm |
| Height: | 1294 mm | 1411-1437 mm | 1371 mm |
| Wheelbase: | 2450 mm | 2825 mm | 2690 mm |
| Front track: | 1541 mm | 1565 mm | 1505 mm |
| Rear (Back) track: | 1590 mm | 1546 mm | 1474 mm |
| Front overhang: | 887 mm | 860 mm | |
| Rear overhang: | 1033 mm | 1017 mm | |
| Minimum volume of Luggage (trunk): | 115 l | 505 l | 420 l |
| Maximum amount of Luggage (trunk): | 160 l | 1510 l | |
| Front suspension: | Independent type McPherson | Multi-link suspension | |
| Rear suspension: | Multi-link independent | Multi-link independent | |
| Max weight: | 2065 kg | 2265 kg | 1850 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc | Disc |
| Kerb Weight: | 1665 kg | 1675 kg | 1350 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Electric Steering | Hydraulic Steering | |
| Max. roof load: | 90 kg | 100 kg | |
| Permitted trailer load with brakes (8%): | 2100 kg | ||
| Minimum turning circle (turning diameter): | 11.6 m | 10.7 m | |
| Permitted trailer load with brakes (12%): | 1900 kg | 1500 kg | |
| Permitted trailer load without brakes: | 750 kg | 710 kg | |
| Permitted towbar download: | 80 kg | ||
| Tire size: | 245/35 ZR 20; 305/30 ZR 20 | 245/40 R18 | 205/55 R 16 |
| Wheel rims size: | 9J x 20; 11.5J x 20 | R18 | 7 J x 16 |