can someone explain to me where to start for fitting a dump valve on my wrc 555 impreza ive fitted a few before on other cars no probs but dont know where to start with an engine like this . cheers

 

depending on the year of yours on top of your inlet manifold there are three vaccum pipes the 1 on the left goes to your dump valve and once you have removed your recirculating 1 you need to put a bung in your air intake pipe and then put your dump valve into the pipe that comes off your intercooler,i am assuming you have a top mount,hope this helps