I just got a set of 05 wrx struts. I am planning on gutting them and putting koni inserts in them and putting them on my 04 Sti. The question is should I use the stock 04 Sti springs or get 04 Prodrive Sti springs or 04 Prodrive Wrx springs? I searched and didn't find what I was looking for. For those who have done this, do the koni's come with bumpstops? Which bumpstops should I use? Thanks again.