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I'll installed the aFe Mach Force-XP HFC X-pipe with Resonators with aFe InTake Kit E90 M3 (stock muffler) and the combination sounds great with added Stage II tune from BPMsport.
I'd call it subtle aggressive, meaning at low throttle pretty much stock, but at 1/2 to WOT it's noticeably louder and more aggressive but still has the signature stock balance in sound. At highway speeds there's zero drone. There's a small amount of resonance at 3500 at WOT, minimized by staying above 3500 rpm!
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