I have a 06 sti and am building the motor with forged internals and a ets rotated kit, 6266 precision turbo. I am thinking about building the heads, port and polish, bc cams and maybe 1 over valves but am not sure if it will be worth it. Are there any real advantages to those mods for my power goal of 400whp, or should I just turn up the boost. My older brother made 360 whp in his 05 sti with a 20g. And I know i am a verrry lucky 15 year old so no need for criticism I am just here for helpful information.