The several previous responses are essentially my take on the matter as well.
A new vehicle isn't where changing to a "high performance" brake hose package is going to provide any dramatic difference, let alone improvement.
In 5 years or longer, there CAN be a difference--flexible rubber brake hoses do deteriorate, but they are required to meet quite high specifications, by US DOT and other standards. The aftermarket has the ability to provide a qualified product, AND to offer it to meet not only DOT specs, but also at other, perhaps higher (European/TUV/etc) standards--and in many cases, provide the hoses for equal or lower cost than the OE hoses.
In the specific case of the Zeta sedan platform, there are multiple variants with several different brake packages....the production "performance" brakes, ranging from G8 GT>GXP, 2014 SS>2015 SS, and other possible fitments, such as Caprice PPV and Holden branded cars--for backfit to earlier or different models with the better brake offerings that have come along later in the Zeta timeline. A range of performance hose kits, as offered by Goodridge, will ensure there is a proper hose combination, validated by the supplier, for that purpose.
As stated earlier, my intent was to ask Goodridge about validating the G8 GT kit for additional/similar brake combinations, such as the 2014 SS (ie. same as the GXP variant)--and to show it as such in their product list. The transition from VE to VF apparently resulted in enough differences to cause Goodridge to consider it necessary to create new kits specifically for the different versions.
My contact with Goodridge provided indication that they do understand the multiple variants involved, and that there would be effort made to elevate the validation of Zeta in their priority list for new fitments.
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