You mean like this http://krbuilder.org/FirewallForward/index.html
See N64KR at http://KRBuilder.org - Then click on the pics See you in Mt. Vernon - 2006 - KR Gathering There is a time for building and a time for FLYING and the time for building is OVER. Daniel R. Heath - Lexington, SC -------Original Message------- Several of the pictures show Mark L. making a spring assembly to wrap the exhaust pipe to maintain spacing for the shroud and for additional heat transfer. There is a cheap, ready made alterative at the hardware store. It is the old style screen door spring that is 12 to 14 inches long and very tightly wound.