Who has done it? From what it seems looking @ rotaryresurrection.com it seems like there isn't much difference in the swaps labor wise. Is it advised to do it? I know that with doing a t2 swap, it is recommended to stay same series, but how about in a N/A? Tried searching, but I didn't see anything else.

 

If you swap all the S4 electronics and manifolds onto the engine, the swap is almost bolt on.

Using the S5 electronics, manifolds and ECU is a totally different issue.

 

you need the s4 front cover too..or block off the OMP and go premix.