can you use s4 irons and s5 rotor housings?? with all s5 manifolds? or no im just dreaming

 

I believe it would fit as the rotor housings seem to be the same for s4, s5 N/A turbos differ by not having the sleeve in the exhaust port and the s5 don't have an egr opening. Am I missing anything?

Putting the s5 rotor housings on isn't going to change anything. It'll just be like the S4.

IF you want to make it like a s5 you need to switch the rotors not the housings.