Hey guys i have a 2004 sti, I want to go stage 2. currant performance mods; mods HKS HighPower CB, KnN drop in filter. other mods dont change anything with motor.(oil temp. oil pres. n boost gauges, coilover kit, brake upgrade.) i have these parts non-installed, HKS EVC, HKS Super AFR, HKS catless DownPipe, cat delete sensor, light weight crank pulley. So my question is, what would you guys do? use the evc/afr set up which is free, or wait n buy an AP V2?