ITB sizes

[spinster]

Is there a difference in inlet size between 4age 16V & 20V itbs
I thought silvertops were 45mm and blacktops 50mm but have come across one that is 47mm

[xsspeed]

http://forums.toyspeed.org.nz/viewtopic.php?t=55516&highlight=4age+itb

[spinster]

thanks for that, plenty of info there but what I was meaning to ask is the measurement at the end where the trumpet is bolted to which will also be the i/d of the trumpet?

[Crampy]

The Blacktop ones are 50mm at the end of the throttle, so need 50mm inside diameter trumpet (obviously).

Never measured a Silvertop, but I'd assume it's 47mm like the one you have.