If i was to lower an sti -20 mm on just springs, would i ruin the handling of the car?

Subaru's handle awfully but have excellent grip.

Subaru also provide the Prodrive spring kit to help and lowers the car, these are made by Eibach to Prodrive specs.

Once fitted suspension geometry should be done, again there's Prodrive settings you can get and this will help handling no end(as will solid droplinks, uprated ARB etc):D

Thanks for your reply,
I gave you the wrong car (To early in the morning lol)
The question should of been for a V4 Type R :)

Mmmm difficult one, when I had my Type R I always wanted Eibach springs but they don't list them for the R's.

Stuck with standard and had fun with the DCCD instead:D

Suppose you could go the whole hog and get KYB AXG dampers and Eibach springs fitted, or some AST coilovers;)