The best replacement for spt is cpt.

The best alternatives to spt are rated as following:
★★★★★  cpt
★★★★★  bearing capacity
★★★★  cobb exhaust
★★★★  q300
★★  nameless
★★  z3x
★★  cobb
★★  perrin
★  cbr
★  shear strength
★  asx
★  dcp
★  fk 452
★  stock exhaust
  452
  rast

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Speaking about spt, one probably shouldn't forget about relative density.

Other search terms related to spt and their ratings are:
★★★★★ relative density
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spt
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bearing capacity