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Old 02-08-2014, 04:37 PM   #9
Join Date: Apr 2012
Location: Burlington,ON,CA
Posts: 25
stock viggen rear rates are ~ 300lb/in. stock 9-3 is ~240lb/in (I can check the exact rates if you want.

My guess would be 400-450lb/in at 6" length. Its a known Eibach ers spring but which one exactly is a mystery
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