Yea For the avcs and the injectors actually. I used the jdm mani but ran the usdm avcs solenoids for a little while as one of my jdm ones broke in transit. so when I got the new valves in I just unpinned the usdm ones and put the jdm ones on. And the harness I have on my jdm mani is my usdm one so the sidefeed injector clips arent the same as the topfeed ones. You can modifiy the plugs by cutting on the edges of the clip. I did this for a little while and then swapped the plugs.
And when it came to modfiying the heads to take the new cam sensors and holes I figured they would be worth more as more people would want them for the usdm 32 bit sti's. So I figured why not and dove in. I dont regret it at all.