[TheB1GDude]

The problem I see with it is that even if you did put the money into building this system you would only be able to use it when the car is stationary! Because if you are running a decent amount of power and you try to "engage" the front diff to make to the front wheels turns you are going to get a spike thats going to throw the car of balance and most likely cause it to flip or spin or destroy the diffs and as much as you can tell yourself that you will only use it when the car is stationary there is going to be a point when you are driving the car that you think "oh it wont be that bad - I'll just turn it on" and bang there goes your Xmod!

Other than that though I think its a great idea - it kind of reminds me of the cars from Mad Max where they can turn the SuperCharger system on and off whilst driving!