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Maybe you should consider a dual or quad resonated xpipe. Should increase the loudness but will cut down on a little bit of the rasp and clear up the tone.
I just installed a Gintani rear section with catless xpipe and it's crazy loud so I will most likely have to get a couple resonators put on.
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2008 e92 M3: Gintani Sport w/ Topspeed Catless X-Pipe, KW-V3
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