[SuperBmw]

With the nylon hose I would run it underneath the car for sure, but since I don't have a lift I was wondering if 4an braided hose would be safe to run through the cabin?

It eliminates the risk of leaks in the cabin, but I'm wondering if the meth in the trunk ignites would it shoot through the meth line as well like the way a gasoline fire shoots across the gasoline?

If that were the case my cabin would set on fire LOL, definitely don't want that. But if it's safe to route through the cabin I would switch my line to 4an for that.