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If you go from an N54 3-series to an N55 X5 or X6, you will feel like you are driving under water or something. I don't think the N55 engine was really meant to propel a 5k pound car. It gets the job done though. When I get 335 or 435 loaners, they feel really really quick by comparison. Not that I'd trade my X6 any day for either of those. I've never driven a BMW that weighs less than 5k lbs for an extended period of time, so I don't feel like I'm missing anything.
From an N54, I'd consider a 50i, or do an extended test drive in a 35i to make sure that you won't find it totally annoying.
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