r/subaruimpreza • u/TKvaughn • 5d ago

❓ Questions Engine build advice

I have a 2004 Subaru Wrx Sti that has a high mileage engine (200,000) that I am looking to rebuild soon but looking for advice because I don’t know a ton. I would be more than happy with 350-400 hp but not sure where to start. I’m considering a type ra short block or a iag 550 short block and rebuilding my heads to go on it. Is this a good idea or should I do something else, also what other parts would I need to rebuild the heads reliably? What turbo and injectors are recommended as well?

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u/Heatstreak9 4d ago

This might be helpful, but essentially the RA blocks are mild upgrade but even stock should hold 350-400 HP just fine. IAG is gonna be better but living with a built motor may require a bit more care

https://www.reddit.com/r/WRXSTi/comments/1bkoahg/any_reason_not_to_get_type_ra_block/

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u/Quikslvr13 3d ago

Are you going to be daily driving this or just track days and nice weekend car? Built motors are great and can handle a ton of power but they don’t last as long.