lets say one is putting in a complete s4 engine into a s5
do i have this right?

drop engine in, put the s4 wiring harness thru the firewall, put in new ecu, take out the old gague cluster, and install the s4 one?
does the original wiring that goes from ecu to gague cluster needs to be changed?

 

i thought that swap had to do with swapping over everything from the s5 to the s4, then use the s5 wiring harness with s5 ecu.

 

yeah... just the s4 bottom end, s5 front cover, everythign s5
but i guess i kinda got discourage when i think i have to plug all those vacuum lines back in when i put it together!!

 

Why would you do that?

 

afraid to deal with reconnecting all the vacuum hoses and electrical connections....

 

You're putting in an S4 engine into an S5 because you're afraid to deal with reconnecting all the vacuum hoses and electrical connections. That makes no sense at all. S4 engines have just as many hoses and plugs.

 

i'd just go buy another s5 prolly be a lot easier