Midpipes without a question. Cost effective and will give you EXACTLY what you're looking for, a more aggressive and rich tone. There are multiple options, personally i've been extremely happy with the Berk resonated mids. Downpipes will add some tone+rasp, but IMO midpipes are the way to go if sound is your primary concern.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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