I hate to rain on the parade but I bought the Teflon tube mention in soarrich's post and it melted the first flight. I have not had any luck so far with the Teflon and have spent about $80.00 so far. I am going to silicone and will sleeve the inside to keep the fire away. (the teflon was also sleeved) I hope this works. I am running a ZDZ 40RE FAI motor with a custom Macs header and a Carbon ES pipe. I may end up with a braided stainless coupling before this is over. Rfabbre, don't waste your money on the Teflon. The material listed above is rated at 500 deg. max and our exhaust is more in the 750+ degree range. Even the Silicone is only rated to 500 deg but is thicker and if sleeved it may last. I used to do this on my glow motors with good success. If anyone knows a source for 1" ID Viton tube that may be an alternative.

Dennis