Don't forget the bell mouths where the runners enter the plenum.
Worth about 10 HP more around 190 to 200 HP.

Paul Lamar

You keep writing this. But one source tells me that the rounded edges of
the bell mouths is the key here, not just the bell shape.

Finn

Possible I guess. Who is your source?
Does he have any comparison dyno data both ways?

I am just going on what Power Sport told me and what is common tuned intake
manifold practice in the automotive industry. I think Mazda would
use it if it was noticeably better than just a simple bell mouth which
they do use along with Mercedes, Ford, GM, BMW, etc., etc.. In fact I am willing 
to bet if that is really true the difference is immeasurably over a simple
Bell mouth.

That feature would certainly greatly increase the cost of machining
the intake runners. In fact I see no way of machining it short of
an NC mill.

Paul Lamar
 
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