blanking plate!

[a4quat]

can anyone tell me whereabouts in the engine bay this would go and what advantages/disadvantages you get with it?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190075691223&fromMakeTrack=true

 

[mas]

Is it for the egr ?

 

[a4quat]

dunno?