I have the Airaid. It seems just from what I have read that the sound of the Airaid is not as loud as the TRD, this has been a downer for me since I wanted more sound. The upside is the price is about $100-150 less and its also street legal with its CARB number and sticker.
From a performance standpoint I would say the Airaid might have a slight disadvantage at lower speeds because it not as tight of sealed box as the TRD.
Just funny cause back in high school.... being a student and not having any money we use to cut PVC Plastic pipes to make cold air intakes and use
my moms stocking at the end for a filter .... GHETTO RICE-ERrR..... hahahah ;D "I'll beat you with my Honda, the stickers and flame paint job add 10-20 horses"