In what way does this parallel fuel rail business benefit the engine?

Might look at getting some of these manifold spacers to reduce inlet temps and while its off I was thinking of the fuel rail mod.

Is it really only worthwhile if your going for big HP figures or is it something that will benefit mild tuned cars - say up to 300 320HP

Ta.

 

Allows more even pressure to each injector, where as the inline system possibly allows a dropping off, of pressure to injector/cylinder 3 causing lean fuelling

Andy