1 Grand limit, what sussy should i get?

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By preloading a spring you increase its recoil or retraction force thus wearing the valves in the shocks much quicker.

ALL Springs are preloaded the instant you drop the car onto it's suspension.

KYB and Tokico are garbage shocks if you are after performance - of course they're not recommended for anything but low spring rates.

Once you go linear springs, you'll never look back.