civic si springs

hello

does anyone know if the civic si springs are the same length as the ext/touring springs?

do the civic si springs lower the car?

i read somewhere the civic si sits 5mm lower, but is that due to the smaller diameter 18s or the springs?

The si springs are meant for better handling than the other models... Why would you want to downgrade?

the intent is to put the si rear spring on an ext model.
i dont want a lowered car, i want a higher rear rate to bring up the spring frequency.