i don't know the answer to this question but every maf that i've seen/installed has to be put in a certain direction, so my guess would be no.
It'll work, but don't expect any noticeable gains.T4 Primera said:Will the MAF work and last ok if it is mounted horizontally?
By horizontally I mean the air will flow vertically upwards throught it.
I'm pretty sure it will work ok, just unsure whether the hotwire is strong enough to last in the horizontal position.