Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Redesigned heads on the 07 sti's

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Old Dec 6, 2007 | 02:43 AM
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Redesigned heads on the 07 sti's

From what I understand they are much better in terms of cooling. Will that lead to any noticeable power gains with a tune?
Old Dec 6, 2007 | 09:52 AM
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Define noticeable?
The effort to swap heads could be used elsewhere for higher gains.
Could use an OEM lower temp thermostat.
Old Dec 6, 2007 | 01:46 PM
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Paul, I have been looking into getting an STI for some time now. I am just curious what the heads would mean to me. I happened to be looking at an 07, and I remembered the redesigned heads but didn't know much about it. I would not be swapping heads..
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