I am going to be doing a honda intake manifold swap using a b series intake manifold with the miata flange. I was wondering does it matter which b series intake manifold to use? Been doing some research and while most people use the type r and type r clones such as the blox, obx, and skunk2. Would a b16 pr3 manifold suffice? I can't get information on how big the plenum size and diameter size to so I can match it with the same size tb. Reason why I ask is because I can get the b16 manifold for $30.

 

https://www.miataturbo.net/engine-pe...anifold-43103/

 

What's the intake size on a b16pr3? Can't seem to find out if only b18im work.