STI Swap question?
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This is a discussion on STI Swap question? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; yea I know im a noob to subarus but I have a wrx and I just got a sti motor ...

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    STI Swap question?

    yea I know im a noob to subarus but I have a wrx and I just got a sti motor what do I need if anything to it into my wrx. Like I mean do I need a new ecu, wiring, etc? thanks

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    He simply abides. SD_GR's Avatar
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    There are several WRX and STi motors but in general you will need mapping, potentially fueling, and frequently wiring.
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    thanks also one more thing I have an IWG on my 20g how do I convert it to EWG can I take it to a muffler shop and have them custom weld my turbo back exhaust?

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    If you are not DIY welding I'd buy the right down pipe and after fitting the EWG I'd remap the car -- you will need EM for the wastegate I'm almost certain. Find someone to map the car, discuss what parts to fit, do the wrenching, and flat bed the car to them.
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    Quote Originally Posted by gokartmar27 View Post
    thanks also one more thing I have an IWG on my 20g how do I convert it to EWG can I take it to a muffler shop and have them custom weld my turbo back exhaust?

    Turbo back should have nothing to do with EWG.. you need to buy an EWG uppipe, the EWG itself, and a bracket to hold the IWG shut (or weld it). And you will need a tune.

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    What year Subaru do you own?

    The following applies only if you own a 2002-2005 WRX:

    It'd be easier to plug the AVCS, retain the stock manifold bolted onto the heads. This makes it much easier without having to swap the harness and ECU. TBH, you'll have much better results using your EJ205 heads with the STi block.
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
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