Ok, i tried to start my car this morning and much to my dissapointment it wouldnt start up. I went up to my parents and got my grandmothers car and jumped it, turns out my battery was just dead. however when i got my car started i looked from behind the car and one side of my exhaust was emmitting a blueish smoke, and the other side was grey smoke. It was cold this morning and i dont have any Catalysts on my car anymore its pretty much straight pipe all the way to the mufflers. The car seemed to be running ok, so i went ahead and drove it to work. I checked it again at work and it wasnt smoking at all, normally it never has smoked except in the morning when its cold. The wierd part of the whole thing is that it was only blue on one side of the exhaust. My car does have a performance header but it all collects then is y-piped later to the dual mufflers. Anyone got any ideas???