It depends on the set that you buy. For example the GSC (STi killer) evo IX cams come in three trims SI for use on stock valvetrain/turbo, S2 for use on upgraded turbo and S3 for a custom setup. I'm getting the GSC S1's installed next week...I can't wait, EVO SE FTMFW.

MIVEC FTW!!!! how are those cosi idle? also do you just have cam gears or do you have springs and retainers i hear you dont need them with the 272/272 cosi you just cant rev to 8000k all the time......... I'm in between Cosi and GSC S1 but i think im going to go with cosi since ill be upgrading the turbo eventually........nice vid. got anymore?

Those IX's are beasts