I may combine that with another trick I came up with:

#declare Count = 0;
#declare Increment = 0.01;
#declare Exhaust_Plume = union
{
 #while (Count < 1)
  cone
  {
   <0,Count * -100,0,>, 6 + Count * 26, <0,(Count + Increment) * -100,0,>, 6
+ (Count + Increment) * 26
   open
   material
   {
    texture
    {
     pigment {color rgbt 1}
    }
    interior
    {
     ior (1.01 - Count * 0.01)
    }
   }
  }
  #declare Count = Count + Increment;
 #end
}

object
{
 Exhaust_Plume
}

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