Another question that should be asked is what are you cooking. If you need to get to 500* then I am assuming that your cooks are relatively fast. If that is the case, then smoke is not really an issue. The purpose for the Noimex is to stop leaks for two purposes, one to help with heat control over the long cooks and to a lesser extent to keep more of the wood smoke to flavor the meat. Let us know what you are cooking and how long and we might be able to answer more intelligently. If you are just trying to reach higher temps searing and shorter cooks then I don't think the Nomex will be of much help. I use Nomex on my WSM but am not sure I would on my Performer. One is for grilling and one is for smoking. Good luck.