I think if you put bigger brake lines on, it will actually be making your brake efforts less effective, according to Bernoullis? law?

 

Maybe stock wires were 7mm.
Not sure, never owned a new 92 GT

 

I never owned a new 92 or 94 either

 

I use the holley wires thier 25 ohms per foot resit really low

 

Bernoulli's law does not apply to closed hydraulic systems like a brake system. It's applies to open fluid flow like air passing through a venturi in a carburetor or water flowing through a restriction in a pipe. Bigger brake lines would have a negative effect on braking but not because of Bernoulli's law.