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I have bought a 2004 WRX STi without a motor because I have s 08 Sti motor I got in a trade.

I know the 08 Sti was a dual avcs motor and I was wondering if 04 single avcs heads would work with this motor.

If not how would I go about having this motor work with the 04 Sti harness
 

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Yes. The heads will bolt right up. If you want the dual AVCS you will need to use the 08 engine harness and a standalone ECU
 
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