Any ideas what it looks like? I can't find any pictures or even any information on what it does.
It looks like this, (Taken from a picture Rio-Gti posted in the "For sale section")

Mine used to make a massive ammount of noise on startup but I took mine off and repaired it

All i know, it apprantly is used for the 1st 90 sec or so when you start your engine. it pumps extra air into the engine for cold starts, (Ment to help with the running of the engine when its cold) then it turns off when its job is complelte I have also been told that it has something to do with emissions?

But I have never hered about deleting it or the benifits from doing so.