silly question :-)

But here goes,
Im looking for an enlarged throttle body but how can i tell if i have one on already or not.
Ive asked the garage where i had it from but he looked at me dumb.
Thanks for reply.
 
Have a look at these. Dont know how else to explain this but You can see the one on the left is matt, then shiny as it goes towards the butterfly, the right is obviously bigger but is also consistent all the way through.
9599934261_d9b4379edb.jpg
image by Etree200, on Flickr