I can only tell you about my past experiences. My last car was an '03 G35 6MT Coupe. There was only one STB, that I know of that really worked on this car. (There was 4 or 5 others out there, but they were mainly for looks) The good bar was expensive ($425.) and they were rare and built to order. There's a group buy that just completed on a G35 forum at $600 each. Anyway, I was one of the first to get mine in Match of '06. I could actually feel the difference in stiffness backing out of my garage and going over the crown of my driveway to the street. It turned that car into a slot car. It made a good handling car into a great handling car. Big improvement, IMHO. I hope something like that comes along for the F.