03 wrx 2.5 swap parts list

Ray

The Northernah'
I cant find a definitive list anywhere, and I know many of you have done this so here are my questions

  • Whats needed for an ecu/wiring
  • What will bolt up from my 2.0l
  • what else would I need to buy (aside from normal "while its out" parts)

 
Everything from your motor bolts on to it I think the only thing needed is bigger injectors and a retune

 
ive read about machining the 2.0 heads to match the 2.5 block as well, anyone else done that?

 
ive read about machining the 2.0 heads to match the 2.5 block as well, anyone else done that?
The proper way is to have them machined. Otherwise the head surface extends into the cylinder. This causes detonation and a not very efficient firing space. There's a really great picture online. But I can't find it...

 
Yes, always use head gaskets to match the block. You need the firing ring to match the cylinder bore.

 
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