It's a friend's gsr. He said it came out of the filter, which led me to believe that he had to broken a valve or cam lobe, or something that would be causing an exhaust valve to remain open and letting exhaust gasses into the intake track. And he said it wouldn't even try to fire, not even on three cylinders. I dont really know, it's at the shop now, just a curiousity question with hopes that someone else may have had a similar problem. He parked it at a gas station, went inside, came back out and tried cranking it, and smoke was the result.