Ok why is in the Euro-R it has the single stage intake manifold then to in the Type S it has the Dual stage intake manifold. which one is better? and why do they have different manifold when it's the same motor?

 

single runner is better

and the euro r is the same motor as the atr thats sold in europe

 

Manifolds Coming Soon....

 

the Euro-R is 220hp same as the Type S same motor and ATR in europe is the same motor just degraded

 

Where is that post that described how the design of the intake runners affected the performance on H motors?

 

I'm not aware of such a post, but I do know that a single runner intake improves top end and the expense of midrange, and vice versa.
I often hear Type R drivers wish they had "GSR midrange" (the GSR has dual and the ITR has single). Unless you're building an all out track car, dual is usually better for the street.

 

how is the single better?

 

single=high rpm power
dual=mid range

its that simple