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Response back from Bilstein support:
"We can confirm that the B8 valving will accommodate modest spring rate increases. 50-100lbs per corner should be ok. Thanks.
If he's referring to stock BMW spring rates, then the Spec-R is as much rate as I can use. I will confirm with them ...
BMW M sport = 120/350 lbs/in.
Swift Spec-R springs = 201/503 lbs/in.
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts
Last edited by dcaron9999; 07-10-2015 at 09:08 AM..
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