I've never read anything positive about the anti reversion cones.
www.nrhsperformance.com/tech_arcones.shtml
www.bestmufflers.com/bshop/index.php
About $40/m and says free shipping.
I got some packing like this stuff from a local bike shop. It's lasted well so far in my 2-1.
www.bestmufflers.com/bshop/product_info.php
hay ron I got some of that perf tube when I built a muffler for a F1 honda last year, from Walla st exhaust in Bundy if you want some in this area they had a lot of diferent sizes n designs what I use is the same as u use
Cheers Peter