Just wondering if there's a difference in the way the inectors attach to the fuel rail between an S4 and an S5. I know the harness is different, but if you resolved the harness issue, would injectors off of an S5 fit into the S4 rail, and vica-versa?

 

They fit exactly the same.

I am using a S5 manifold with S4 fuel rail and S4 injectors.

I use to use the S4 fuel rail but will be going to an after market FPR so I need the S4 rail for it's end threads.

 

The fuel injectors are all the same dimension.
The S5 turbo intake manifold is taller, and the fuel rail is mounted differently for adjustment.


-Ted

 

OH!
Your right!

I had to use a washer or something to make the S4 rail work just right.