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I did a single to dual conversion on my 330i using the Magnaflow 12138. The only concern I would have for the dual muffler delete is that drone will definitely be annoying.
As far as diffusers go I believe there was a diffuser from Cyba for an OEM 335 bumper if you wanted to do quads but they stopped making it so have a looksee.
As far as vids for duals go there are users arctic330, VTECaddict, and koreez (or koreez88) that have some videos up for that. PM me if you have any questions about the dual setup. It cost me about 300 for exhaust alone.
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