Replaced back box. Picked up last MOT as the outer was rusted and coming away. Not blowing. See the pic of the old one below. Looks suspiciously like a date code, if it is, it’s done very well. My FL is a March 06 registration on 157.5 k miles...
There's one that runs across the front, at the bottom of the engine just below radiator. That's the intercooler hose. You should see in going into cooler on drivers side.