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I've been running one on our 335i with 94K miles and 535i with 39K miles for over a year now. On the 335i with full FBO we collect several ounces every 1000 miles. On the 535i with just a JB4 we get an ounce very thousand.
We did the walnut blast on the 335i right before we put on the catch can. We also have the high side BMS catch cans installed. However, they don't catch a whole lot.
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