It will give no gains in power over the stock fuel system at all. None. If you use larger injectors, you will actually loose horsepower if left untuned. If you don't have any mods that need more fuel, you won't need a higher capacity fuel system. Fuel tuning (like an APEX'i V-AFC and some dyno time) will grant better gains.

If you want a car that is unaffected by fat friends, buy something with a 5.0l or bigger engine. If you love Hondas, you have to live with it.

A reground/aftermarket cam is a good idea though.