You need the early WRX "blues" - 02-05, 440cc, or JDM STI pinks, which are 565cc. The 06+ WRX ones will also work, and they flow even more than the pinks, but I'm not sure exactly how much, probably 570-600cc.
The only ones that won't fit are the ones from the USDM STI.
Also I have a set of the 440's in the FS section. /plug