I've been playing around with a few ideas for a heat shield for my K&N filter for a while now and yesterday while at the local hardware store I had an epiphany when I saw some 150mm flexible extraction fan flue. So $37 later it came home with me.
I have made up and fitted a prototype to see if it works and if it does I'll make up a tidier version and fit it properly, with a guide for anyone who is interested. In the mean time here are some shots of the prototype in place