I would suppose that putting it before a 90 deg bend or greater radius that it could mess up atomization a little due to decreased air velocity caused by the bend. Although I suppose it could also increase turbulence, and maybe be good for atomization? I am not sure. Anyone else want to chime in on this. I use a TMIC, so it is right before the TB. I have also heard 6-8 inches if possible, but I suppose only a few inches before the TB wouldn't hurt. Is there a reason you physically can't put it 6-8" from the TB or closer?
DP