Spark plugs now fitted they was well worn the tip on a few had nearly gone.I went for the plugs because that's what Subaru use as well as what the car spares shop says.£35 lighter but can sleep better at night.Im nearly at the end of my stage 0 tune now checking everything over.Got to replace the inner cv boot tomorrow now on the drivers front.Spark plugs was easy on the forester to change.Remove washer bottle and airbox and undo engine mounts and jack up for access.