Looks almost exactly like my setup.. Except mine have a slight angle cutoff at the end of the tip versus yours being even (top/bottom) at the end. Looks like single tips too because i believe stock mufflers have 2 small pipe coming out into the stock rectangle tip.

Mine are 3.5" as well, except since i have muffler deletes and only one large pipe coming back to the bumper, my tips are a Y pipe design single into 2 split.

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2006 X5 4.8is Fully Loaded