Only late S13s and S14s come with slippers tho ben (and only S14s come with trans coolers, not that they do anything), and pretty crappy ones at that, any serious drifters put in Cusco diffs.

And all cossies come with slippers, crap ones again tho, like you said, need pumping up a bit.

SXs, esp S14s, do have nicer power delivery tho.