So I moved my D2 from my WRX into my new STI just unhooked the harness and plugged into my STI harness. No new cutting or splicing of anythign needed.

However when I accelerate I hear a whine cming from the speakers (only if nothign is playing or the volume is low or unit is in standby). I am confised because it sounds liek a ground issue but its the same harness as my WRX and I had no problem there

any ideas???

Yeah, double check the grounds in your STI. It may not be a problem w/ the harness, but w/ the actual ground.

there is a ground on the side of the factory unit, to the brackets that secure the radio, make sure that is connected as it was before you put the avic in