Easy old fellow, actually this BOV was produced and tested specifically for this car, so the engine would not run rich, backfire, foul plugs or shorten the life of the Catalytic converter.
My only problem with this thread is that if your going to make statements like the one listed above, you better bring some good data to prove it.
Actual Air/Fuel Readings using a wide band 02 of the car before and after your mod.
I think its misleading to make these claims with no data.
I do like when new ideas are presented and attempted. I hope it does work out in the long run.