E91 LCI front lowering springs

[brenthay 10]

Hi guys

I have recently bought a 2009 E91 335i LCI M sport. 

Loving it so far! 

So the rear ride height is perfect, so I'd just like to lower the front 30 odd mm. 

Does anyone have any experience with the super low king springs? They are available in pairs, so would be perfect. 

I dont really want to touch the rear, just the front. 

Thanks in advance