I have an 05 M6 with factory clutch settings, springs & such. A bud of mine just put a Gold primary spring in, & an orange spring in his secondary with the shift assist from D&D. I am really impressed with the smoothness of the engagement & want the same for mine. I cant find the "Gold" primary spring on Cat sites, its said to be 1/2" shorter than the stock yellow/white. Any clues to where to find it? I dont think its the Titanium spring. $$$ Yikes.