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Mostly due to name brand, ease of "bolt on", fitment, etc.
Magnaflow is just as good (hell most companies use their mufflers for their kits). I plan on going with a custom magnaflow setup soon. I had one on my 325i and my buddy did a setup on his 330i.
Or you could just do what I did to my M3 and go straight pipes and scare the shit out of everyone! lol
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