2004 XC70 with 238k. I've been noticing a slightly louder exhaust noise over the last few months. I've had a couple people ask me if I have an exhaust leak even. From inside of the vehicle, it sounds like it's coming from below the radio. I put the car on ramps the other day while changing the oil and looked for a leak or hole in the exhaust, only to find none. All of the exhaust looks pretty decent with very little surface rust to speak of. I crawled under there with the engine running and I couldn't feel a leak or discern exactly where it was coming from. It sounds an awful lot like it's coming from the area of the flexible portion of the downpipe. Is it possible for that to leak without showing signs of wear or a hole? I really can't find a hole or rubbed area or anything anywhere. I have no CEL at all. I do get a very faint hint of exhaust on startup in the cabin, but no other time.