You may be able to use the sleeving that is designed for plug wire in drag applications.Depending on how thick the bundle is you are running.I ran mine inside of heat shrink,then loomed around them.I had to tuck them right up against the block underneath of the headers themselves.The heat still will damage the loom,but the wires are protected and I have not burned through them yet. If you do run them under the headers,secure them so they do not work their way closer to the headers than they already are.