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      06-28-2018, 08:48 PM   #7
bbnks2
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Drives: 135i N55
Join Date: Jan 2017
Location: NY

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I would love to see these other people's bottom mount kit with "proper" AN fittings and stainless line... You need to use rubber here to allow for some flex across such a short run. If you used AN fittings it would basically be a rigid connection. AN fittings are pretty large/bulky.

Just about all turbo kits on all platforms use a rubber line on the drain. It just makes the most sense for something that sees 0 load and needs to flex. Don't sweat thsoe comments and think you need to spend $200 on a metal drain line lol. You get the benefit of a greater ID with the rubber line, too.
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