the d16z6 / JDM d15b / ESI (local to the phils) manifold has some long runners swooping upward to the plenum , since the platform is mostly a commuter effort
and OEM , low rpm driveability prolly was the main concern
downside is, it is quite convoluted as far as flow goes especially when the engine set up is hotter than stock,
here we do the ff :
cut open the plenum , to be able to port the runners, and slightly flair up the entry
for improved flow , porting the runners from the flange side
and tig welding the plenum shut
picture above : is of the bare plenum surface and runner entry surface
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