400hp,
I do not know what the HKS splitter does but the one that I built does not drive the front constant it simply reduces the effect that the latitudinal sensor has on the attessa.
The GTR's have three sensors (2x Longnatudinal (to measure + & - g-forces) and 1 X Latitudinal (to measure sideways g-forces). Once the longnatudinal sensors measure a certain amount of g-forces it will engage the front wheels as it has assessed that the car can be wheel spinning. However once you turn a corner hard (you must be under acceleration for the longnatudinal sensor to bring the front wheels in) the latitudinal sensor REDUCES power to the front wheels, thus making the car very "taily" in it's handling. What my splitter does is allow you to dial in how much influence you want the latatudinal sensor to have and thus dictate how much front wheel drive you want durin cornering whilst accelerating.
It must be remembered that the longnatudinal sensors are the once that brig the front wheels into the equation so unless you are accelerating you still will not have any 4wd exactly the same as it does standard. The spliter simply reduces the power of reduction that the latitudinal sensor has. In a straight line the car will perform as standard. In corners however you can dial in how much front wheels you want.
You could achieve that possably by changing the sensor (lat) but with the dial so that it can be varied you can alter it as you desire for such variances such as wet or dry, slow or fast corners. It makes the car vastly safer and greatly alters tha handling characteristcs of the car making it incredably neutral.
One of the things that I have always found a little disapointing about the GTR's is their handling (I will say the same for the WRX except it is far harder to fix) due to the oversteer problems that they suffer. The splitter cures these problems and makes the GTR one very imrssive handling car, for a road going car.
For the record I also encourage people to get rid of their hi-cas if they wish to improve handling.
Hey a good set of Koni's will also help.
Mick.