They have not been dyno'd on a stock car that I have seen yet. I am waiting. the c&l only makes 5 hp or so with the plenum alone. Anderson motorsports has some graphs but it in on 300+hp engines. I don't know if you can trust them though becaue they talk up the dragon and the test just run over at the modular depot did not show the dragon having any advantage. basically the acufab with 70mm tb and the c&l with 75mm tb seem to be really close. If you already had a 70mm tb the acufab is the way to go. if you need tb and plunem both it is a coin toss. I would like to see the trick flow and bigger tb on a sock car.
The TF pipe is still to new and I don't think many people have them yet. Based on the design however, I would bet that the C&L plenum will perform better overall. We will have to wait and see what happens.