I got my CB400A given to me and both of the mufflers have the ends cut off them and gutted. they are fairly loud. I would like to get the trumpets that are left on there off and put on some mufflers. I have loosened the clamp and tried to remove them with no avail. so I came here to see if any one had any info on how to remove them. I have sprayed the joint with penetrant and tried using a strap wrench... heated them up by running the engine and still nothing. any other ideas would be appreciated.. btw I am new here and bike but have been building cars and the like for years.