The plug can be left, it's not used in this country (I think it is to do with American emissions?). The hose that 't's' into the breather is just the breather from the petrol tank, which goes to the throttle body. Just replace with a straight piece of pipe. The black hose with the arrow pointing at it is your isv (idle stabilising valve), which you will need to keep! There should be a take off on the charger setup for this. Use 1 of the ports on the none return valve on the brake servo vacuum feed, for your recirc valve. And yes, just extend your maf wires, use heat shrink to keep an air tight