That's weird, i was under the impression that the jdm sti 6mt had similar gear ratios to the RA gears The USDM sti 6mt can be mated to the ej20 as well, but then you have to get all the necessary components for the dccd. I've heard leaving the dccd disconnected should only be temporary. Most people swap used jdm sti 6mt w/out dccd.