I had 2 choices when getting my car engineered for the zorst.change to stock and pass the db test with flying colours or leave the sports on.if the zorst is to loud,and you want to keep it then you have to throw a silencer welded into place into the muffler tip.it cant just be bolted back into place i was told,because it can be removed.same goes for bov.i was going to buy the gfb hybrid bov but had been told by the same engineer that that he wont pass it unless it completely plumbs back into the system.
I passed emissions with fmic & bov.Guilt toy passed with over 330rwkw.so it can be done.you just have to follow some of the guidelines
the gfb (black) stealth plumback series is great looking as it makes the car look stock,serves a purpose and is completely legal.they cost a pretty penny tho.if you buy the whole kit with the plumback pipe kit you are looking prolly at $450-$500.tho they cost less without the plumback kit..buy the bov,go to supercheap and buy radiator hose (1976-79 ford falcon fairlane 8cyl top hose) that will fit the 40mm bov outlet.Then size it up for fitment.then cut the stock plumback metal pipe back far enough to suit. and u will cut out the gradual "S" bend in it.Then make your own reducer out of a smaller hose,put that over the newly cut metal pipe and fit the new pipe over the reducer and clamp it down tightly on both ends.
If you buy the extra plumback kit/pipes the bov will stand out like dogs balls still with all of the silver peices.at least this kit it looks well hidden and like it should be a part of the engine bay.