I have the Goodridge SS lines and am happy with them. Evidently, Goodridge has an uber premium series that includes a vinyl wrap over the braided SS … but I couldn't locate these for my 2013 Z so just stayed with the standard SS lines. The fittings seem solid … no leakage provided you snug them down well.
In terms of the stock lines on the 2013 Z, I don't think there's anything special about them. I think that only the 2013 Nismo Z was fitted with the high-rigidity lines and high performance brake fluid (DOT 4). The Owners Manual and FSM for the 2013 (even with the Sport Package) doesn't specify the high performance fluid, only Genuine Nissan HD Brake Fluid or DOT3 equivalent.
I didn't notice a big difference when I switched over … perhaps a little more responsiveness when stepping on the brakes. I switched them over in the late fall. I may know better in the spring when I take the Z out of winter hibernation and re-bleed the brakes since I suspect there may still be a small amount of air in the lines that was introduced during the switch.
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