Hi everyone roadrunner37 here and new to forums. I have come into having a 2004 307 hatchback auto. for the last week has been a great little car and I really enjoy driving it. 2 days ago it started to make a weird noise from the exhaust. best way I can describe it is like a long continuing barping, rasping sound which gets louder as the speed rises. there are no holes or cracks in the system. All I can think of is somehting has come loose in the rear muffler as that is where the noise seems to come from. any ideas as I,m at a lose as to know where to go from here.