Wirings easy in a mk2, everything bolts off so you can run the wires wherever you like. Theres a couple of good places to mount crossovers too, one underneath the dash, just to the left of the steering wheel, theres a sort of shelf which I mounted one crossover too, and a similar thing to the far left of the dash, underneath (or slightly to the side, I cant quite remember!!) the glovebox. Had quite large crossovers and still managed to fit them tidily out of the way there!!