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You may want to go a slightly different route. I paired the unmodified OEM axle back with the Evolve Xpipe which has HFCs and resonators. There is zero drone throughout the rev range. The volume is only about 5-10% louder when driving "normal". In fact there is barely any difference with the windows up. When you put your foot into it, things change dramatically. The volume increase is enough to get everyone's attention and the tone is very unique but refined. It's definately an octave or two above the muscle car sound produced by many aftermarket exhausts, but not raspy at all. I only mention rasp since there is a YouTube video out there with this setup and the mic has a hard time capturing the sound. There is only one drawback of this setup that I can see... you have to live with the weight of the OEM axle back.
BTW, I opted for the cold start delete with my tune and with this setup the car is much more civilized than a bone stock M3 when firing it up in the morning. It really is the best of both worlds.
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