Can The "Sound" Be Found?

It all started when I wanted that "sound". You know the one ... vroom vroom! I didn't really want to spend a ton of green to get it either. I found a mod on the internet that sounded (no pun intended) logically like the one that would do the job. Logical is good right? So I rounded up all the goodies I would need to complete the mod, and began. It worked beautifully. The sound was gooood. The spark plug color was acceptable. I rode into the wind, and had the "sound". Life is good! - I was riding down town one day about 400 klicks after the mod, and decided to crack open the throttle and unleash that sound for a couple of blocks and bingo the upper insert popped out somewhere on the road. I new because the sound changed noticeably. I opted for the chrome plumbing type of insert, and I used the liquid J.B. Weld to hold them in. After the one had pooped itself out, I thought perhaps I had done a poor job of gluing them in. So I took them both out and resanded everything, put lots more glue on them and installed them again. After waiting the specified time for curing, I hit the road again. Pretty soon after they began to loosen up again. I noticed that the glue had become really brittle and seemed to be "baked" it was easy to just chip it off. I decided that there was something really wrong here, and I became determined to solve the mystery. I thought, okay because the metals are dissimilar they will expand and contract at different rates. So then I began to think that I needed some product like silicone that could take the heat, remain flexable, and hold the inserts in place. I popped the insets out once again and cleaned them up for another go at it. This time I thought I had the right product - Permatex Ultra Copper. Could this product be the rascal I was looking for. Well it definitely worked the longest, but it too is loosening up. My next plan of action is to Permatex them in place again, and then, using a portable exhaust pipe expander, expand those S.O.B.'s in place. Hopefully never to dwell on it again! As of today I don't have the expander, but it is coming. I will update.