i've got a cobra pipe, and i've never burnt my self, pretty much the only way you can burn yourself with pants on is by leaving your leg on the pipe after you feel it beginning to get warm, or mabey if your pants are wet...
I'm currently riding:
1984 honda110
1982 honda185s
1986 honda bigRed
1984 honda 250R-- .80 over, cobra expansion chamber, shaved head, decked cylinder, larger carb., carbon-fiber reeds, 18" carsliles, RK race chain, uni-filter.
1986 yamaha IT200
1985 yamaha XT250
1978 Italie Snark Moped
and some vintage dirtbike.