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					Originally Posted by  RETed
					 
				 
				The one with the gray sticker, right? 
That's not on a turbo model, so I can only guess... 
If it's a kouki FC, it's most likely VDI? 
(After looking at your fuel injectors, you look like you're running a zenki FC non-turbo - most likely 6-port?) 
 
If you're talking about the "mushroom" part, it's just an air filter. 
 
Yes, most of them are swappable. 
It's a matter if they are "NO" or "NC". 
I haven't confirmed if they are all one type of another. 
Never priced them brand new from the Mazda dealer, since most guys chuck them when ripping out emissions - pretty easy to find used. 
 
 
-Ted 
			
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 Never heard this terminology... Kouki (kooky  

 )
Yes, I am speaking of the grey one.  And these photos are from my 6 port 88 vert.
It's good to know they are common, I will cast about and see what I can find.
Thanks again Ted. Always Helpful