I have an 85 K35 with all stock true dual exhaust and for the fist time since I bought it two years ago, I have lately been noticing that it pops out smoke rings from the tailpipes. Perfect smoke rings like someone talented can make with a cigar. It is the coolest thing I have ever seen. They are most noticable shortly after startup on cold days (below 0 celcius...30 or so F). It is weird because I have changed nothing in the exhaust, but I know I would have noticed it before if it was doing it. Has this happened to anyone else? I wouldn't change it for the world, it looks like I have set it up custome to do this. weird