we see threads about this all the time, no-one ever actually ends up doing it. The bottom line is it's just not worth putting a pipe on that cost's more than the engine
i got a fmf pipe in a klx style frame with the 160 fitted
yes its genuine
yes it cost heaps[not more than the engine]
view and vote for it at fifty of the month
the pipe looks fairly std, its very loud.
any good bike shop should get it in for you
the bike holeshots like no tommorow
if you have trouble getting 1 , i will help out .
i'll take some pics if you like