will gc headers fit on my 2.5i?, can't find this answer

 

Maybe. Hard to say. I think it is close. I think unlikely though.

 

unless its swapped to a wrx motor I think the ports off the heads are in different places. What size engine are they off?

I would say I dont think so

 

Uh... What are you talking about? 2.5i is an NA motor. The headers between that and WRX are totally different.

Let's get some clarification by what the OP means by GC? Does he mean a USDM GC? or a JDM GC?

A set of headers for a USDM GC quite possibly could fit. I am not sure though. I wouldn't bet on it.