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Ships within 48 hours · Estimated delivery Oct 27 - Nov 1
150 lbs/in
165 lbs/in Barrel Type
3" B-pipe to dual 3" muffler
The increase in spring rate is based on the upper limits of the vehicles factory shock valving
Supports both twin turbo N54 and single turbo N55 BMW 135i variants
Swift Round Wire Linear Rate Bump Springs 400 lbs/in Metric Coilover Springs 150 lbs/inRound Wire Linear Rate Bump Springs 400 lbs in Swift Bump Springs are made from a proprietary material. The same springs are used in Super GT, Formula Nippon, F3, F3000, Super Taikyu, IMSA, Pirelli World Challenge, Rally America, VLN, Le Mans Series, Formula Drift, and many other professional racing avenues.
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