How did they make an illegal TC system, and keep it 'secret', when all the legal ones sound so awful and obvious. If they can make a nice sounding one why don't they still? Surely it would be less intrusive and less damaging to an engine/transmission, and would be better for part-TC requirements (i.e. just stopping a bit of slip, rather than OMFGwheelspinz TC would might remain horrid sounding).