i cut a hole bigger around my stock little 2" hole in front of the fender well to put in a 6" flexable ducting pipe and ran that to my front vent, it was sweet at low speed, but i noticed it sucked at high speed, cause apparently (scc project 300zx had same problem) the maf cant read the super turbulent ram air. the air comes in with such force that it doenst get metered right and fucked the maf reaing up. but up to 30 mph it was noticeable, after that it began to bog and run like shit.
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1990 hatch ka24de gt2871r
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