Version 3/4 Impreza are the inlet and exhaust valves them selves different between WRX and STI versions?

Also are the head castings different between WRX and STI?

As the WRX has over bucket shims and STI has under bucket shims.

Cheers

 

valves for the STi are different and should be marked IH / EH.......

 

What would Wrx be marked with?