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Originally Posted by TheHouseWon
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Well, you would need 2qty of it so double that cost. Breather filters aren't good ideas (unless you plan to replace it every month, they get very dirty quick and a clogged breather filter is bad for the motor). There are numerous debates about it and the conclusion on each of those thread is to leave the hose in tact. So having oil catch cans retain the OEM vacuum pressure to the crankcase while capturing the oil that passes by (between the intake and the PCV valve).
I spoke to a few M5 guys. They said clean the PCV valve regularly and there shouldn't be oil blow by issues. On the new M3/M4 S55 motor, BMW has built in an oil catch can system that recycle the oil. That explained why I never had to top off my oil when I had the F80 M3 for 12k miles. I only had my M5 for over a month, already went through over a quart. Downshifting hard increase the chance of oil blow by, which I did a lot of that.
Fact: Oil getting into the intake lowers fuel Octane level. Second, we have direct injection so the injectors can't clean the oil collected on the intake valves. That's where walnut shell blasting comes in every 50k miles.
There are cheap catch cans online. You just have to make brackets for them.
http://www.ebay.com/itm/Billet-Alumi...hVNuJR&vxp=mtr