was search the bay of flea and found these very expensive but mmmm

http://cgi.ebay.co.uk/Fiat-Cinquece...CarParts_SM&hash=item2eafd94c9a#ht_500wt_1154

200518749338

don't half look dodgy lol

Ash

Mmmm, shiny toys

Looks like they're in the classifieds too https://www.fiatforum.com/classifieds/showproduct.php?product=20359&cat=all

ebay one are 36mm classified ones are 45mm

Ash

36mm are for the fire engine the 45 are for someother engine.

only thing that puts me off these (very much so) is the fact they use a slide not butterflys.
they have done that to make them easier to make. but means the flow at part throttle wont be as nice (lots of turbulence)
the slide is prone to sticking,freezing (even more so as this has the injectors before the slide)

now the worse one.
the slide is a perfectly flat machines surface on a perfectly flat machined surface.
over time(not a lot of time either) the surfaces WILL wear causing leaks that will make the engine idle bad (the revs will get higher over time, you will turn the idle down but this will cause the engine to randomly stall)

so this would be good for pure race stuff where you will spend most the time at full throttle.