Can stock silencer be used with new pipe?

[testicle]

Quick, simple question- I have a 2002 KX125 and if I put on an FMF Fatty pipe, do I have to get a new silencer for the bike, or would the stock silencer work in conjuction with that? Secondly, since the bike is pretty new, when I change the pipe, is it completely necessary to change the O-Rings and everything? Thanks.

 

[1999RM125]

yes, your stock silencer will work.
No, my oring was as good as new on my 99 when i put my pipe on last year!