well, it only smoked a bit, about 30 second. It has 107,000+ and I haven't done anything to it (when i mean nothing i mean nothing, just oil changes and filter changes). I was expecting to smoke out the neighborhood. I guess I have been lucky but a problem I found is that it was smoking from not only the exhaust, but from under the car (mufflers leak) and from the engine where the headers meet the exhaust. My question is should I replace just the exhaust system or swap out the headers while i'm at it. Any suggestions would help, thanks.