Going lower than 2" without a short-stroke damper will not work. Even Konis with stiff valving from hell will still bottom out and die.
There aren't any off the shelf short-stroke dampers for the 240SX in the US. Your options are to buy an inexpensive "full coilover" like the D2s or Tein Basic, or rethink the whole "I want my car to look like the suspension is broken" thing.
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