For sound, best bet is to delete the resonator and keep the 4.6 mufflers. Finding dinan mufflers is almost impossible now. Any muffler with that resonator is heavily muted. I had cutout installed that bypasses the resonator when I want. I have closed the cutout (to use the resonator) maybe twice over 2+ years. Going to just delete it eventually.

I uploaded a YouTube video of my exhaust and a buddies 4.4i with a Corsa exhaust. If you've been researching exhausts you've probably already seen it though.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)