ok guys i have a 90' integra and was thinking of putting a b16 in it just for the price diffrence of the b16 and b18. i dont have a lot to spend and i am told that i already have all the hook up needs in there because i do have a b20b in there already but thats going in my rex so i wanted to put a b16 in. what all do i have to do i am told that i dont need a new tranny, ecu or wiring harness and i know it just slides in any help would be greatly appreciated.