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i'm going to do something that someone else will do very soon...

but if you use the search button.. you'll find lots of info out ;)

N75 valve is to do with boost, recirculation (dump) valve etc. It helps to open and close the valve.
 
give it time mate - you'll learn a lot of these forums, and its members! :)

On the main site (seatcupra.net) you'll find a good resources section, with how-to guides (and pictures) which can help understand a lot. A lot of links that will help too!