Is that an Arkym diffuser? Remember, you can adjust the exhaust, just move it all the way back. Mine sticks out just a tad past the diffuser.
You can kind of see it in these pictures:
I guess another question is are you sure it's an E92/3 muffler and not E90?
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Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT