Is this possible? Direct fit? What about emission? I was told that i might run into those problems..

 

So I ended up finding info on this and it can't be done with out granding something. But what if I have a good set of s5 housing and use my s4 rotors on them. Would the power be the same as a whole complete s5 motor or a lot less since im using s4 rotors?

 

AFAIK the s5 intake manifold in a direct bolt on onto the s4 keg. The only problems you run into are the 5th/6th ports are actuated off vacuum instead of pressure, and you need to rig up the VDI to a RPM switch or other fashion to get it to work

 

I'm going to look more into that. I'm sure I'll find a step by step on how to get it done.