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Been having a lot of problems with the engine and it finally went on me and I want to do a sti swap in it and wondering what everyone else has done. People say go stock and build. Or go short block sti.
 

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Depends on your goals in the end. If you just slap in a sti long block completely you'll gain some power and a little torque in vacuum. However the rest of the drivetrain and sti everything else will cost you more than an sti.

What are your goals exaxtly

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Everybody wants 500hp. Do you realize the money you're going to have to spend to get your 09 WRX there?

You can build the engine and fuel system to handle it, which is going to run you around $15,000.

Then you'll need to upgrade your transmission, to either a PPG Straight cut setup, or an STi 6 speed swap so you can make it more than 1000 miles without shearing every tooth off the gear, so there's another $4,000.

Then comes making sure you can stop.... so plan on throwing another 1-3K into an STi brembo swap or big brake kit.

If dropping 20K into a car that's worth 13 sounds like a good idea to you, move forward.
 

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The sti transmission swap is more involved from what I read and will cost substantially more than 5k.

What you are asking for will cost you well beyond the price of a brand new sti. If you want 500 hp you may want a different vehicle. It can be done, but it's absurdly expensive and you will be replacing the engine often likely 5-10k miles if you are squared away peefectly

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I want right below 500.

No point in doing a STI swap if that's the case.. you will need a built engine. The case halves and crank on your ej255 are identical to what's in the STI ej257.. everything else will need to be replaced with aftermarket parts. By buying a STI shortblock all you would be doing is wasting $1900 on parts that you won't be using anyways.
 

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No point in doing a STI swap if that's the case.. you will need a built engine. The case halves and crank on your ej255 are identical to what's in the STI ej257.. everything else will need to be replaced with aftermarket parts. By buying a STI shortblock all you would be doing is wasting $1900 on parts that you won't be using anyways.
This.
 
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