this file should finally do the trick:
http://www.mediafire.com/file/zenm1r...SS_Uboat2D.val
one more thing that came to my mind.. Racerboy released single exhausts for type II subs, I'm going to use this as an option for W+E Combi mod for my personal needs, but if you are interested in adding this as an option to Combi mod:
http://www.mediafire.com/file/ejjn2gyzmj0/W+E Combi Single Exhaust for TypeII.7z
these are files that I posted (the links above) this morning are working for me