3 of 4 of my exhaust hangers broke about the same time. All 3 that broke were poly hangers. The 4th that did not break was an OEM one since the poly one's are difficult to stretch and finally gave up trying - thankfully since it's basically the only thing holding up the exhaust. These were installed about 7.5 years/85kmiles ago when I did my TBE install. Brand is Kartboy.
I live on a road with speed bumps, so I'm assuming that's when they broke was driving home. I don't really see much of a reason to use poly hangers unless you have a problem with the exhaust moving too much. This is back when I was much younger and dumber, assuming if there's an aftermarket part, it must be better. Considering I live in the salt belt, 80k is fairly impressive, though I predict the OEM ones will out last them far greater. Going back to rubber will probably reduce my NVH as well.
If you have them installed, I recommend checking them every oil change for deterioration. A quick search on "kartboy exhaust hanger failure" yields some results but doesn't appear to be a widespread problem. Consider going back to OEM before a failure occurs. Talked to a mechanical engineer at work and thinks poly hangers are just stupid.
I live on a road with speed bumps, so I'm assuming that's when they broke was driving home. I don't really see much of a reason to use poly hangers unless you have a problem with the exhaust moving too much. This is back when I was much younger and dumber, assuming if there's an aftermarket part, it must be better. Considering I live in the salt belt, 80k is fairly impressive, though I predict the OEM ones will out last them far greater. Going back to rubber will probably reduce my NVH as well.
If you have them installed, I recommend checking them every oil change for deterioration. A quick search on "kartboy exhaust hanger failure" yields some results but doesn't appear to be a widespread problem. Consider going back to OEM before a failure occurs. Talked to a mechanical engineer at work and thinks poly hangers are just stupid.