So you took the FF springs off and put on a different spring? That blows my mind, lol.
Im almost willing to bet that the GC's default is going to be stiffer than the Sports. I doubt they'd have the same rates right off the shelf. If they are similar or about the same, Chris, like you said, get them on the stiffer side. We just need to figure out what rate to get them. We dont want something too stiff.
Seeing as how GC uses Eibach springs, I bet they'll know rates. You might even be able to explain to them what we're trying to do and they might be able to help pinpoint an exact number. That'd be awesome. It'd save having to go back and forth between the two.