Ok I have an Hanger 9 P-51 PTS and loving it. Went flying on Sunday and noticed an excessive amount of oil on the plane after flight. While refuling I noticed the muffler was lose and tighten it. But now I notice that there is still a small amount of liquid leaking from where the muffler goes together in the middle of it. Is this a problem and do I have to get a new gasket for the middle of the muffler? And it is not leaking from where it is mounted on the engine. Please let me know.