The less bends, the better. Think smooth air flow. Try both positions. I have a 87mm MAF from wms. I had it calibrated for their cai. Why? Because the wms cai has the same 90 degree bend in it before the maf. My filter is down, btw.
I have one and it's in the down position because there's something in the fenderwell that prevents it from going in a straight smooth position. so, my filter is in the down position also and I don't seem to have any problems.
1 bend before the MAF ?? ya imma order there MAF and throttle pipe down, maybe this weekend. i have my straight.from the fenderwell.seems i pickd up some hp/tq ill try the other way and see what happens