FrankSS

iTrader: (18)

Hey guys... does anyone know what the difference is between the fast lower shells for the 78mm and 90mm intakes? Ive seen the shells sold separate, so i was wondering if you had a 78mm bottom, would the 90mm top bolt up??

TIA

landonew

Yes. As far as i know the only difference is the upper shell. I assume you will want to replace the gasket as well.

02silvaZ

iTrader: (12)

i think they are interchangeable but not positive

radkon

iTrader: (2)

There is no difference in the lower or middle part of the FAST intake. The only difference is the upper shell has a 90 mm throttle body opening. I have used both top shells with the same lower and inner parts.

I'm not sure on the new 92 MM shell though.