Hey quick question guys. Are the s4 and s5 n/a exhaust the same from the manifold back? My s4 exhaust on my auto is messed up and I found an s5 full exhaust and wanted to make sure it will fit?
Thanks

 

I think the only difference is that the S4 needs the SAP (split air pipe) for the 5th and 6th ports, other than that, they should be interchangeable.

 

They are pretty much the same except for what Primos003 said. I tried swapping mine onto my friends S5, but it didn't work that well, but mine is all custom except for the manifold log, so you might have better luck than I.

I think as long as you swap the split air pipe over from the S4 catalyst you should be ok.