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My catch can system is working fine. Not too much buildup so far, but I'm also using Mishimoto's high flow diesel can so it can hold a lot larger volume.
My silicone elbows and adapters are holding up fine. I've been monitoring them since it's not supposed to be compatible long term. Getting oil rated ones though are pretty darn pricey. Of note, stick with HPS brand elbows. I tried a cheaper one from the UK, and their ID/ODs weren't controlled very well and were unusable. The thicker wall meant it couldn't fit between the electrical connector and output at the top of the engine.
The corrugated tubing piece we need for the US 328d only seems to be available with the US part number. We have an extra sensor on the intake that the EU models don't appear to have. The good news is that you should be able to buy the EU part, and then cut the corrugated tubing to length for the US one since the EU one doesn't have the rubber reducer, and should be a bit longer.
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