This will seem like a newbie question but the only time I have tinkered with the fuel system , was to replace a dodgy sender unit in the old chargerd vx v6 we had so please humor me

Firstly does an aftermarket fuel rail kit add any performance benefit over the stock system , or is it more a bling thing.
Secondly I have a L77 so does that mean I would look for an LS3 kit since the L77 isint an LS2.
And lastly whats a reputable brand , and please provide links to the full kit.


Thanks guys,
Jas