afaik the vos would need to be a turn specific to NA specs...not sure if there is one, and not sure if anyone in parth is able to tune the vos
as said just buy another std computer for it and see if it makes a difference; waste of money doing much on a NA as you get very little gain for you $$$.
OR
drive the GX into the ground and save your money and buy either a RS liberty or WRX