12si's are worthless unfortunately.
put any bigger parts than stock in it and they have 0 idle output.
all 12si applications we swap out for cs144's, but the mounting ears are about 1/4'' farther apart.
with the application the 12si's were used in the wider mounting ears of the cs144 doesn't make a difference. I'm not familiar with your vehicle, but if we can use a cs144 you would be much better off. any possibility?