David,


If the OS silencer is a bolt-on (rather than a bolt-through, like the FX), it should work.
You will have to take your engine for a walk around town, to obtain the correct metric bolts, so the OS silencer could be bolted on.

Make sure the gas passage in the silencer is not smaller than the engine's stack, as it can impair flow.

The #3255 works very well with all MVVS medium engines. I haven't seen any effect of its small volume, as you say.
It comes with the proper bolts...