im swapping my s5 n/a engine into an s4 chassis so i have something to drive for now... but i need some help on what i need to replace from the s5 to the s4 help me out let me know your ideas and suggestions !! please.

 

just use the s4 externals, thats all you need to do

 

http://www.rotaryresurrection.com/2n...o_s4_swap.html

 

what i'm trying to do is put a whole s5 block with s5 ecu into this 87 t2. of course i'm going to swap over the longblock, wiring harness, and ecu. but do i have to change the dash harness and all of the electrical under the hood? will the fuel pump relay still work the same with a s5 ecu?