I put a shallow dent/crease in the top of a titanium Arrow X-Cone muffler. Heat gun alternated with applications of compressed air duster and dry ice. After 3 days of this the dent appears a bit more shallow. But at this rate I'll still be applying heat and ice in the spring. I'd prefer not to have to disassemble the muffler to gain access to the inside of the cone. Any suggestions?