Wich manifold do you guys think will flow more air? a FD or RE! of course throttlebody also! I'm trying to deside for my s4 engine build up.

I have a upper FD manifold! before having a machine shop build me a spacer plate to join the s4 lower and FD upper, i thought mabe the RE manifold (lower and upper) could bolt right on??

 

I made a REW upper fit a T-II lower before. Requires a small amount of grinding and filling but nothing serious. It would take longer to make the spacer than it would to adapt it. I personally think my custom upper flows more that either factory manifolds. A little harder to make though.

I have heard that the RE manifold flows more than the REW since the runners are larger. Haven't personally seen one so I can't verify this.

 

but I would assume that the FC lower with an FD upper flows better than the stock FC combo?

 

It should!

 

The fc upper manifold sucks!! I now that greddy makes the adapter for their FMIC to bolt on the TB, but whats the chance they will sell it with out there kit?? The FD upper with the greddy elbow just looks ******* awsome! I just bought a apexi GT spec FMIC core so custom piping has to be made