you know our stock manifold has a baffle in it so each of the cylinder will breath the same amount of air, im thinking that with the weapon-r cylinder 1 might get less air than cylinder 4 and cause to lean out

 

heres someone elses but mine was worse, dont mind the red ring its not my pic

 

if this were the case the all the other performance intake mani's would do the same, which they dont. The problem with the weapon r is they probably did no research into the correct runner length or plenum volume to make any kind of power.

 

its good i didnt buy it , nobody had it in stock so i bought rims instead

 

other than weapon r i dont think anyone else makes an intake manifold. correct me if im wrong though.
the jdm fit/jazz has a black cast manifold that has a differant shape than ours.

 

its plastic