I just checked with RealOEM and center muffler, part number 18307646960, seems to be connected to front muffler and rear exhaust system with simple clamps. May be I will visit local exhaust shop to see if they can build something to replace center muffler, so I can put on stock later if I don't like the sound. 
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00 323ci blk, 03 S2000 sil, 04 525i sil, 05 X5 beige, 07 328i sil, 08 C350 gray, 10 MCS Conv gray, 10 MCS red, 12 ML350 BT sil, 13 650i GC blue, 12 E350 Wagon 4Matic blk
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