Not to rain on Ron's manifolds,
but the junction between the plennum, and the port runners is no where near as nice as the LIPP.
The LIPP has a nice radius, and is actually larger at the junction,
making for a nice funnel shape, that gives better flow.
I noticed this at the git go when he posted up the original drawings.
That is why I have been keeping an eye on this thread.
The only thing close are the ones in Japan, that actually have little velocity stacks welded inside.
And guess what, they are the same price, only they are fabricated,
and have rather small clearance over the rear runner.
This LIPP is Titts !