Yeah, there are no "factory chambers", but the expansion chambers on that bike are made by Factory Performance Pipes (FPP) with stingers in place of the cans. I have two sets of those for a 350 sitting in my brother's garage for his RD350. Nice pipes, sound great with no big "hit" in the powerband, pretty smooth.iused to have the 350 and I raced an earlier model too.
that thing you posted is a POS. (imo)
I know of no factory chambers.
so much of the bike is missing its hardly worth anything.
no guards no instruments , who gives a damn if he bought new grips this season.
pass this one over , there are some real gems out there.