AEM intake is great. only one ive seen that includes a plug for the oem maf to tune it for the extra air flow and piping size. it uses a hybrid AEM/ K&N dry filter as well. not the prettiest intake but works great. Ive had it 3 months or so, no CEL light and dealership said nothing to me about it either. I pm'd jeremy @ ft86speedfactory.com because they use both the AEM and AFE on their frs' they said the AEM is a bit better but a bit more $$$. Perrin looks really cool but might get into the way of the rad and will be tedious to change filter or clean. whereas AEM has 4 bolts that remove the top and the one hose clamp.
link:
http://www.jscspeed.com/catalog/Suba...ubaru_BRZ.html