G4X PlugIn Key Features (where applicable):
Up to 6D fuel and ignition mapping
Precision closed loop cam control (four cam, independent control)
Sequential fuel delivery
Digital triggering, all OEM patterns
OEM idle hardware supported
5D boost control with three switchable tables
Motorsport features - antilag, launch, flat shift
Continuous barometric correction (on board)
CAN port
QuickTune - automated fuel tuning
Individual cylinder correction
USB tuning cable included
Stats recording into on-board memory
Gear compensations for spark, boost and fuel
Real time selectable dual fuel, ignition and boost maps
Sync and crank sensors can be a combination of Hall effect, variable reluctance or optical
Boost control referenced to gear, speed or throttle position
512 mega bytes data logging memory
Staged injection
Knock with "windowing"

The following expansion connector inputs/outputs are provided: 
Gnd                Sensor Ground Only  
+5V Out        Low Current +5V Supply 
DI 10                Digital Input for switching functions. 
DI 9                Digital Input for switching functions. 
An Volt 9        Analog 0-5V input 
An Volt 8        Analog 0-5V input 
An Temp 4        Temperature sensor input 
Aux 8                Auxiliary output (2.0 amps maximum when driving to GND. 0.5 amps maximum when driving high.)