Here is the complete description for the Mercedes-Benz 271.860 CGI engine and its gearbox:

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Engine Overview: Mercedes-Benz M271.860 CGI

• Engine Code: M271.860
• Type: Inline-4 Cylinder, DOHC, Turbocharged
• Fuel System: Direct Injection (CGI – Charged Gasoline Injection)
• Displacement: 1.8L (1796cc)
• Aspiration: Turbocharged with intercooler
• Valvetrain: DOHC with Variable Valve Timing (VVT)
• Max Power: ~184 hp (varies slightly by model/year)
• Max Torque: ~270 Nm
• Compression Ratio: Approx. 9.3:1
• Cooling System: Water-cooled
• Ignition: Coil-on-plug
• Typical Models Used In:
  
• Mercedes-Benz C-Class (W204 C200/C250)
• E-Class (W212 E200/E250)
• SLK-Class (R172 SLK200)
• 
  

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Gearbox Description (Paired Transmissions)

The M271.860 engine is commonly mated to one of the following gearboxes:

1. 

5-Speed Automatic (722.6)

• Type: 5G-Tronic
• Code: 722.6
• Hydraulic control with electronic management
• Smooth shifting, reliable, used in early models with M271.860
• Torque Capacity: ~450 Nm

2. 

7-Speed Automatic (722.9)

• Type: 7G-Tronic
• Code: 722.9
• Electronically controlled, more efficient and refined
• Found in newer W204/W212 models
• Torque Converter with lock-up clutch
• Torque Capacity: ~550 Nm

3. 

6-Speed Manual (Optional in EU markets)

• Rare, mostly for European models
• Short throws, sportier driving, not widely used

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Complete Engine & Gearbox Set Includes:

• M271.860 engine complete with:
  
• Turbocharger assembly
• Fuel injectors & rail
• Intake and exhaust manifold
• ECU (Engine Control Unit)
• Wiring harness
• Ignition coils & plugs
• Throttle body
• Sensors (MAF, crankshaft, camshaft, knock, etc.)
• Cooling components (water pump, thermostat housing)
• 
  
• Gearbox assembly:
  
• Transmission unit (722.6 or 722.9)
• Torque converter
• Gearbox ECU (if not integrated)
• Mounting brackets
• Transmission wiring harness
• Shifter module (if available)
• 
  

Let me know if you want half-cut description or installation compatibility info!