Quote:
Originally Posted by e90David
it actually pulls slower since it weighs a lot more than the 330i
maybe it just felt different because you weren't used to it 
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Actually a base 2006 530i is only 55lb heavier than a base 2006 330i.
Quote:
Originally Posted by in5ane_3
Remember the ECU adapts to your driving habits. If you drive your car conservatively it'll feel "slower." If the 530 you drove was driven enthusiastically then that's why you would think it felt faster.
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Agreed, this sounds like the most likely explanation.