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I was thinking of the same, as I just also purchased a x5 50i with a dinan tune. On all my previous cars, I usually put in a x-pipe. However, when I did this on my old Cayenne TT.. the sound didn't change much. Shit., dont even know if there is an xpipe for our car. A custom exhaust is always an option, but I've been hit and miss in that category for quite some time with various cars.
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