STi 4 pots alone will help the feel with any pads. Exeter Subaru is usually the cheapest around (bought mine there) www.subaruwrxparts.com
You'll need to bed them in well, before you start noticing a big difference. 1 Track day did it for mine.
(KC...you becoming a Mazda spokesman, now that you've won the pro at the Boston rev-it-up and have a free trip to Cali? You must have connections now....get me a 90 Miata donor to build a spec racer, will ya?)