first make sure all the bolts are tight there should be one that runs through the muffler also .if its really bugging ya and still leaking try a small amount of RTV silicone a local auto parts store item make sure it is the kind for aluminum and make sure the muffler is clean when you use it. denatured alcohol works great to get most all the oil off so the silicone sticks properly , don't use too much and you will be set.