Looking for some help identifying an iron the I recently bought as a package for a short 3 rotor. Was told it was an S5 center housing, I'm assuming its an NA housing. Looking at doing a semi PP so would like to match center irons with this modified one.

 

looks to be an n5 n/a but the pics aren't of the best angles to tell. the only thing i can see is the tension bolt is encased under the exhaust port, which means it is an S5 housing, either turbo or non turbo. doesn't appear to have EGR ports in the intake either.

pretty certain both turbo and non turbo center irons have the same port timing, so either should work.

 

It doesn't have the tapped hole above the intake ports. I was comparing to another iron that I believe to be an S5 turbo and it actually has different port timing than that motor.

 

The housings have a number cast in, just below the philips screw on the side. Yours is a "C" casting, which I believe are from an JDM/euro n/a S4 engine, the US ones have the EGR ports in them.
The ports are the turbo housings are larger.

 

Any idea if the intake ports are the same geometry and location across the S4-S5 series?

 

definitely is a non turbo since there is no thread for the intake manifold.
definitely is a series 5 iron with the tension bolt support

i just couldn't tell you if there is any difference in irons overseas versus our USDM ones.