They do like to rub thru. The one on my 323i sprung a leak in the metal line right before I did the auto to manual swap over. So it does happen even with the factory lines. I can just imagine what a non factory shaped would of done.

__________________
Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install