Does S4 or NA center irons work with a S5 t2 motor if port size was not an issue?

 

Yes, they all swap.
The difference between non-turbo versus turbo is the EGR valve (S4 only?) on the center iron for the non-turbos.

S4 turbo versus S5 turbo - the ports are SMALLER on the S5 turbo center.

EGR passages might be slightly different between the years, but it's a minor thing.


-Ted

 

So s5 t2 center ports are smaller than s4 t2? What about the front and rear ports s4 t2 vs s5 t2?

 

Yep, most people don't know that...
The S5 turbo primaries open like 5-degrees later...so small port.

The secondaries are identical for both S4 turbo and S5 turbo.


-Ted