Are there any difference between the housings in either engine?

I know the S5 aluminums have the knock sensor mounting location. But aside from?

I read somewhere that S5 aluminums have the spark plug located slightly higher or lower. (I forget which.) I believe it trades power and efficiency for emissions...

Is there any difference between stock porting? S4 N/A to S5 N/A mainly, but if anyone has S4 Turbo to S5 Turbo, that info could come in handy too.

Thanks.

 

There is a larger oil "catch" or reserve in the S5 housings. It's considered to be better for the motor.

 

That's the Irons, I'm assuming.