The super sport springs from h&r will kill your shocks but the sport springs are within the range of acceptability for the shock so 10k isn't going to kill anything. Springs are a good way to stiffen the ride a little, shocks/springs or coils would be the way to dramatically improve the handling...
To the posters that would like to scare the OP... Really? 10k on sport springs? Again I say, really? C'mon, you can easily get 50-60k no problem on a 1inch drop... 2+ inches is completely different story but the sports will run just fine with the stock shocks!
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'12 335i Sport Apline White w/black... Totaled
'14 535i xdrive M-Sport Carbon Black w/Mocha Nappa
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