So I bought a ej255 longblock with engine harness for my 2004 subaru wrx but the engine harness doesn't fit on my plugs what would I have to do to get it to work I've heard a lot of changing out the intake manifold and the throttle body and cam sensors and put my 2.0 ones is there another way my mechanic wants to order the 2006 ecu and chasis harness but sounds like more money need advice thanks ?