We also used an asbestos exhaust pipe wrap from the last joint to the end of the pipe extending out of the cowl. the looks are not bad and should last a long time. We did this on both pipes of the RV9-A slider.
On the other RV9-A tip-up, I plan on using this wrap for the entire exhaust.
http://img208.imageshack.us/img208/3467/img0404sh7.jpg
Patrick N. Garboden/Todd Wiechman building in Wichita, KS
Ozark, MO
RV9-A slider 942WG (reserved)
RV9-A tip-up 942PT (reserved)