Not sure what this means as I'm not a mechanic but thought I would ask. I had my 300 out the other day. The car has duel exhaust all the way back. It was a little cold out so obviously I could see the exhaust smoke. But I was curious as to why smoke was shooting out one pipe and not the other. Only the driver side exhaust had clearly visible smoke while the passenger side had nothing. The car runs great, I haven't noticed any issues while running. Any help is appreciated, thanks.