I have a 2004 WRX with a full turbo back exhaust as well as a catless midpipe. I have noticed a few times after leaving work that my car is belching out a single puff of white smoke after starting out at a traffic light. It does not always do this and does not emit any smoke at WOT or a idle. It has only done this when cold after leaving work. I have seen a few threads on this, but is this typical for all WRX with a full turbo back without tuning? I am also moving to the Seattle WA area soon. What will I have to do to pass an emissions test over there? Will adding my stock midpipe be sufficient?