That rules out a front wheel bearing which commonly causes a roaring noise when driving. If the noise is louder when you listen under the middle of the car, suspect a rusted muffler or a hole rusted in some other part of the exhaust system. If it's louder up front under the hood, a rusted emissions tube is more likely the cause. There should be a metal pipe, about 1" in diameter, threaded into the exhaust manifold. Those often rust out. Be careful when poking around looking for the source of the noise because those parts will be hot and the exhaust gas coming out of a leak will be hot too.
Sunday, February 26th, 2012 AT 11:29 PM