What would the best fmic be for a ko4 setup? Are the sportec and o.ct really worth the extra money? Also which ones fit behind the stock bumper? I'm sure theres a bunch i'm missing just post and i'll add.

i would go with ECODE but i rather have the dual side mount intercoolers

Homebrew!

I am using the EVO it seems to be good but there is a bit of cutting involved when installing this under the stock front bumper

Why are the sportec and o.ct fmics so much more money? Are they actually any better? Anyone have one or the other?

i dont think so
its more of the name
like why is louis vuitton more expensive then COACH

Lol excellent analogy.

Evo would be the best for the ko4, or the spp. The apr one is the absolute best fmic made for our car, it has a top and bottom flow design.

the vertical core design isnt as efficent in terms of boost loss but it is better for cooling

When your making 26psi+,boost loss is a ok thing when your trying to cool something flowing that much air.