Hi
anyone fitted a 5th injector if so how much ,were bought and what part of the engine did u fit it to
ssubaru

Why oh why? thats the cheap n nasty way of getting more fuel- you can get uprated injectors for scoobies, do it that way.

If you had to, sure the best place would be the central plenum of the inlet manifold. I would have thought this is the best way to guarantee equal distribution of extra 25%.

Do agree that there are better ways of doing it.