Yes. You just have to remember that the emulator takes up about 14 MM
or so of spring space, so you have to subtract that from the length of the spacer that goes on top to achieve the overall length reccomended. You can call Race Tech and tell them you are using the progressive rate springs, and they may have specific reccomendations for that setup as well. I think Race Tech has a non-compete agreement with distributors, but I'm not sure. I think emulators are like $169.00 everywhere. Anybody know different?