I think it's normal... I believe its the induction roar and when you open the throttle, it become more prominent. You don't get it on 99.5% of other XC90 as they are turbocharged and the turbo silences the induction roar.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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