My mod is similar to this
http://www.zpost.com/forums/showthread.php?t=852041
The muffler was open to the original welds. The piping is very neatly without disturbing transitions and smooth arches. However, I have no pictures of the open state.
We see no difference from an original. TÜV was no problem. (I knew the auditor not)
In 2 weeks I post new pictures of the alps.
Here is one from the last year.
