Was getting ready to ask the exact same question, thx kred.
I have the USDM 2004 STI box.
Reason for me to install, I get a slight popping/bind from the trans when taking off from a stop with the wheels turned ( leaving a driveway, entering the street, in a parking lot, etc ). Initially thought it was the front diff ( PO did not update sundials and it ran about 2qts low for a long time due to leaks ) but after talking to those familiar with DCCD I suspect the non-controlled lock position of 35/65 may be the root cause.
Thanks for any info on this, worst case I/we may have to lead the way. May go the manual controller route first altho the "intelligent" models look pretty slick.