I am helping out a buddy and he has a big problem with his car. 2002 wrx 2.0 stock internals and turbo but lots of other aftermarket goodies. He just got the car a couple weeks ago. The car runs it smokes very badly and has misfires on all 4 cylinders. I did a combustion gas test in the coolant and it passed that. The oil looks very clean as does the coolant. He told me he was driving it and had the boost on high which is around 20 and all of a sudden it started smoking and running real ****ty. Is there any way that the turbo seals could be leaking oil in the exhaust and the misfire is because the turbo is bad. It seems ok just off of idle but still smokes very badly, not driveable.