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The Slipstream was obtainable in Season 32: "Street Racers" by reaching level 6.
Slipstream Texture is the newest L6 reward from the season. Its comparable to other 250K textures such as (but not limited to) Chilling, Vibrant Hologram or Touchdown, and is very much interchangeable with those.
Supply is widely distributed — no single holder owns enough to register as a hoarder.