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Why would anyone run a regular f80 spring on an m4?
How could / would they have the same spring rate? I promise you that the m3 and 335 do not have the same spring rates stock as the chassis stiffness, design and dampers are completely different.
H and r just throwing some random ass spring rates at your car. I have no confidence that they have done any research into the spring rates for the m3/4.
Whatever floats your boat I guess. I just can't believe someone would install that on their car.
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