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If you want to go full custom...you can easily find a check valve that can handle our boost level.
I can only imagine the amount of people who feel their oil catch-can is working well; just by looking at the canister and seeing oil in it. We recently did walnut blasting on my brother's 30kmiles N54 Z4 with an oil catch can. Yes there was oil in the canister so he assumed it was working well. Pulling apart his intake system told a different story.
We can easily check if our catch cans are working well by pulling the upper hose going to the driverside. If you see oil pooling at the upper check valve, the catchcan is not filtering/separating well.
BTW, I've tried 2 different types of catch cans with bad results by the check valve. Hopefully the next type I try will show better results.
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