I bought a NX proton wet kit for my 95 z what is the best way to splice into the fuel line?

 

hmm, is it a different fuel line then an older car. I just cut the line and added a T. On a fuel injected motor I would do the same thing. I would just cut the line close to where it entered the fuel injection, then T it then add a regulator and plug it into the nitrous.

You may or may not need the fuel regulator. Not sure what pressure your kit wants.

 

I would but the fuel lines are the ridged hard plastic type.