I heard a rumour it was down under the passengers side head light unit somewhere in a boost pipe, is it true ?
Yes, on or very near the intercooler.
Its on the top of the passenger side intercooler. You need to remove the light, bumper and the light cradle tray to get to it.
Bumper off on the passenger side will give you just about enough to get to the MAP sensor... What's the issue ? They are rather reliable- if you need one i have a couple, just need to know if it's big probe or small probe...
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I must have tiny hands because I never moved my bumper to do this! Light and cradle worked for me.