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From my experience with the 10+ magnaflow's we've done on e9x M3's the sound got louder/ deeper with miles as it broke in. However, the initial start up was definitely noticeable compared to stock.
Ordered mine from my supplier a couple days ago, should have it any day now, so will post video once I get it.
If its not loud enough, I may just gut the inside or possibly throw an electric cutout on it..
We'll see.
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