Well if it would actually increase the runner length then it should increase the torque. From what I have learned about runner length here,
TPiS, says that a longer runner should result in more torque but slightly less hp. But for an ecomodder who never sees high rpm's this could be helpful. I am also into making things fast and I would not install a tb spacer for hp gains on my Camaro. No one has found gains, but they dont look at fe.