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I can only comment on my hawkeye sti prodrive springs which are red, lowered the car by a good 25mm. If you look carefully you should see prodrive stamping on the springs. You could try contacting prodrive themselfs to see if the wrx springs are lowering or just uprated for performance.
Looking at 53wrx pics that looks more than 25mm, possibly 35mm
Unlikely. Prodrive (Eibach) lowering springs lower by 24mm - this IS alot in scooby terms - any more and you're into alot of suspension correction issues