The V4 has LOTS of grounds as well as aredesigned power plane, and the PWM Injector ouputs has its own ground conenctions, isolating it from the sensory and control systems. All in all, noise has been a major factor of concern with the design, and one we have worked hard to combat.

I would say the best way for the optional extras is as per our VTS PNP loom. It has another plug that alows you to connect in an 'options loom'.

Matt