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      07-17-2012, 02:26 AM   #28
doughboy
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Drives: E91 335i Sold.
Join Date: Jan 2009
Location: UK

Posts: 6,375
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In answer to the OP - M sport has different springs, dampers, anti roll bars and bump stops. I spent a lot of time looking into this is 2009.

The spring 'tags' like D3 or D7 etc are ratings within a certain spring size and can only be checked using the parts computer at a dealers.

The D3 or D4 etc are determined by the model variant, engine and options. Things like sunroof and auto are heavy and will change the springs fitted at manufacture, so there is no way to work it our yourself.
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