i've search and was unable to find a good source of info on how to do this swap. so far i know i have to use the 04 engine harness and ecu or an adapter harness for the 05. but is this the only difference? same drop in as a a2? thanks.

 

good luck on finding the source bro

 

basically the same thing..gotta use 02-04 rsx harness..with hybrid-racing wirng harness..thats what i used..check out k20a.org lot good information should help you out..