I am new to the forum and new to the blue oval except for the 31 ford pickup I have had for 40 years. I just bought a 2003 Focus and when its cold it has a lot of exhaust noise then after 15 min or so it will mellow out. I have read a lot of threads that seem to be close but not sure what to do next. Last thing I w ant to do is take it to our local ford dealer as they are high and very sloppy on there work always leaving things off etc for our work vehicles. Is there a part in the system that expands to quiet it down? It's really starting to annoy me and its a good little car with only 68k miles on it. hope it's something that can be fixed easily without replacing a ton of parts until it gets better.