Ive always thought if its before the bov... That it will shoot out the bov during shifts. And if Im spraying my iat with meth.... Then I would think the meth is cooling down the iat sensor way more then the much hotter air going past it and that would give incorrect temps.

Now the Dsmap guys.. And the megasquirt guys suggest mounting the iat before the meth... And infact both groups often suggest mounting the iat down by the IC in direct path of oncoming air... For best resistance from heat soak.