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Final note...and should have been mentioned earlier...
Our stock 135i would constantly bottom out the bump stops in high-speed impacts. A problem noted even by Car and Driver in their review of the car.
It got so bad, it's mushroomed plenty strut towers.
Bilstein HDs are high-pressure monotubes, which add a bit of effective spring rate (hence, a bit taller ride height after most installs). Since installing them two years ago with stock springs, the car is a tank at any speed. Never bottoming out on the highway, etc. A gigantic improvement in that department.
This is a VERY common experience with them, and part of the basis for the reasonable belief that it will benefit in the current situation...possibly in combination with returning the suspension travel to near OE length.
We'll see.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)
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