for you guys that are running an x-pipe on your x5s - did you notice any performance loss or drone inside the car at low rpms?
I ran an x-pipe on my e46 and after a few months the drone around 2k rpm started getting on my nerves and it felt like i've lost a few horses at low rpm as well...

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'06 X5 4.4i| (08/06 built date) | Executive Edition | Sport Package
'08 X3 (wife's ride) - Sold
'05 325i - Sold
'03 325i - Sold
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