I would recommend one make sure the "sealant" used is 100% silicone and not a lesser value. I have used GE Silicone and GE Silicone II, RTV, and a few other brand names that escape my memory at the moment. All of the 100% silicone sealants I have used last very well and take all the heat the exhaust system can dish out.  I even used some GE Silicone around the header pipes where they slip into the head on my ol' 66 BSA Hornet, and a year later the silicone was still all there in good shape--just a little sooty colored.
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Larry
2003 T-100 (790cc), NARK, NH Togas, 8100 rpm rev limiter, 158 main jets, 42 pilot jets (less than 1 turn out on pilot screws), stock needles--no shims. 13 A/F ratio from 1100 rpm to 4000 rpm; 12 A/F ratio from 4000 rpm to 6000 rpm; 13 A/F from 6000 rpm to 8100 rpm.:D
2007 Tiger 1050--White:D--SW-Motech crashbars, Skidmarx rear hugger/chain guard, Calsci +7 windscreen.
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