1. Does anyone know if the F.I. HFCs make that hissing sound that everyone complains about with the Berks? I'm getting my exhaust installed Saturday (and am totally psyched btw!) and I've also got a set of HFCs to go with it, but I don't want to install them just to take them back off if they do, in fact, hiss.
2. Also, do you think it's worth it for me to sell the HFCs anyway and wait for the long tube headers to come out?