CNC ported Stealths or Trickflows are very similar in performance.

Stealths are straight plugs whereas Trickflows have angled plugs
Stealths have open combustion chamber whereas Trickflows have a little more modern designed chamber.
Stealths look like a stock head on the end Trickflows do not.

I've run CNC ported stealths all over on the street and run 11's @ 117 mph with them in a car with 3.55's.

Both work equally well on a street/strip car.