Well for me it was easy since I have two x5's that use that amp. I figured if it wasn't the problem I would have a spare. At the same time if your going to keep this x5 or even get another one to replace it one day and stay in the E53 year range your going to need it sooner or later

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install