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I had the Akro DP and recently added the MPPSK to my 340i. I was a little worried about how loud the car would be and had the same idea. But honestly after hearing it and driving it for a while, I don't think the noise level is at a point where you would need to add in a resonator or a sec.cat. Especially that you can always put it in comfort and its almost stock level of noise (just a tab louder). Cold starts are definitely louder though but I guess you can tame that down with your BM3 option.
Also, the sizing might be a little tricky as the stock downpipe has a oval shape to it while the MPPSK downpipe piece is more round. Anything is doable I guess if you go to the right place.
My advice is to stick with a reputable DP.
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