Can an S5's upper intake manifold and TB fit on an S4 without extreme mods? if possible, are there any performance gains?

 

do a search, im sure you can find somehting about this one.

 

need the LIM for it to work.

 

but the s4/s5 blocks are interchangeable?

 

blocks are practically the same. from what i know (correct me if im wrong.. i havent built a motor yet)
but youve gotta consider the s5 vdi system is completely different from the s4. you need the whole assembly. you can recycle the throttle body.

 

you can't exactly recycle the throttle body unless you want to premix or use the s4 tb and front cover.