Silvia CA18ET front facing intake mani query

[CNHSS1]

CA20E 'canadian' spec manifold i used up until recently.





and one of my mates fabricated 'copy' attached

if running more boost and or bigger turbo, there are pretty big gains in the mid range torque, although generally only adds a couple of bhp, but as its troque that makes a car quick, its really noticable