hey what kinda of car first, and is sohc and dohc that would help because the sohc cold air is two piece and the dohc is one piece cold air.
Im sure you can mod the aem cold air to fit the injen just need to find out what size piping you are using(2.5,2.75,3 inch) then get a matching sized injen kit would most likly work just need try and find out

Sorry that everyone flamed you on the other thread