http://www.1stsubarudealer.com/subaru-block/
Will a Subaru OEM Short Block EJ2507 WRX STi engine fit a 2003 Subaru WRX?
The website I’m looking at for the engine is http://www.cimotorsports.net/motor-sport-products/subaru-oem-shortblock-ej25-sti.html
The path I followed to find the engine is:
Home » Subaru » WRX/STi 2002-2007 » Engine » Short Blocks » Subaru » Subaru OEM Short Block EJ2507 WRX STi
I wouldn’t be doing the swap on my own…I have a brother for that. 
Yes, the block will happily bolt up to whatever heads are on your WRX currently(although if you’re going to get this block, get STi heads). The transmission will also bolt right onto this baby as well. But a couple things…
1. $2000 for a short block? Thats a bit extreme, check out Gruppe-S, they have entire engines, STi ones as well for about $3000.
2. You will need to get a tune to make the engine run right.
3. You will need to get a bigger turbo and upgrade the exhaust system, the stock turbo will not be able to feed this engine properly.
4. Your drivetrain on your car will not last long with the power that you will be putting out with an STi engine in your car. Fixing this would involve either straight cut gears(extremely annoying for a daily driver) or an entire STi Drivetrain, which will run you about $6000.
From the sound of things, you probably wouldnt be doing all of this yourself either. Which, well… is going to cost you a ton. If you were going to do it yourself, I’d say go for it and good luck, but in this situation i have to say…
Go buy an STi
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