The AEM CAI is by far my favorite Intake. My dyno numbers were with that Intake and So far I have had absolutely no issues with it.
If you are going to do it why not get a true Cold air and Modify the Left front fake vent and make it fuctional so you have a true Cold air Intake instead of just a short ram. Because I can tell you right now. My car on the Highway on a 100 degree day will be getting the nice air from outside instead of the hot air from under the hood.
Either way they are all great in their own way.
Steeda I believe makes a good kit they just need to supply a hose to get rid of the wrinkle pipe behind their set up.
Fswerks very similar just uses the factory MAF
K&N is my favorite Short ram complete replacement of all factory components. If they had steedas MAF housing and that Kit I would buy that in a heartbeat.
AEM is a true CAI and offers the benefits of CAI. If you slot out the left fake grille those benefits are much more noticable especially at speed. At the same time a True CAI also has it's own faults. If you slot the grille you have to worry about deep water past that there is no other negatives.
Hope this helps.
2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq