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Old 03-26-2025, 08:59 PM   #1
alfakarl
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2015 FA20 into 2013 BRZ Swap Quations

I'm installing a 2015 manual FA20 in a 2013 manual car. I've seen conflicting information on if it's plug and play or not and need some definitive answers.

1. Can I simply drop in the 2015 engine and use my original ECU?

2. Do I have to use my original 2013 wiring harness, coils and ECU?

3. What sensors would I need to change out if I use my 2013 harness?

4. Can I use the 2015 wiring harness and my ECU?

5. Can I use the 2015 ECU without programming?

6. Do I need to swap injectors if I use the 2013 wiring harness?

7. Do I need to swap injectors if I use the 2015 wiring harness?

Thanks!
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Old 03-26-2025, 11:20 PM   #2
EndlessAzure
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Everything is plug and play, as long as the engine harness is still attached to the 2015 engine.
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Old 03-27-2025, 02:35 PM   #3
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Originally Posted by EndlessAzure View Post
Everything is plug and play, as long as the engine harness is still attached to the 2015 engine.
Can I use the original ECU from the 13?
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Old 03-28-2025, 01:26 AM   #4
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Quote:
Originally Posted by alfakarl View Post
Can I use the original ECU from the 13?
Yes.

The only difference is if you use the 15’ engine harness and coil packs, you have upgraded coil packs.
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