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King springs recommends shortened shocks with Superlows and lower, I had superlows in my old VS and even with decent shocks
I think people underestimate super lows, they just look at the wheel arch eye brow not how much the rest of the car/driveline has dropped and how far the springs have compressed, yes SL doesn't look like it fill the guards that much but it drops the whole body of the car a pretty decent amount.... without the correct shocks for the springs, you are asking for trouble.