I broke one of the primary fuel injector diffusers while removing it from my S4 TII engine. I have a set of S5 diffusers on hand (they're out of an n/a, but I think for S5s they're the same across engines). I haven't done a test fit yet, but they look like they'll drop in fine. Any reason I shouldn't do this?

The S4 TII diffuser looks like this:


The S5 looks like this:

 

Not directly answering your question, but are you still running injectors built on 80's technology? A modern injector has no need for this. I don't like how brittle they get either...they've been known to break off and fall into the engine.

 

the S5 would probably be a small upgrade, i'd use em if that is what i had.

i would not worry about it breaking either, they just don't break, and if you've ever seen what the engine will do to a bolt, a little plastic won't trouble it at all

 

Cool, I'll run these. I have stock S4 TII injectors.

 

Just from handling during R&R is what I meant. Him still running a stock injector kind of seals his fate, short of ordering brand new ones (are they even still available?).