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Difference between 04-06 USDM STi heads and 07 heads?
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09-06-2007, 12:26 PM
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Jeremy@Cobb
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Member#:
106514
Join Date:
Feb 2006
D25 cylinder head castings castings
- Added air injection
- 49.6cc combustion chamber
- Cooling passages, and most internal area of the casting is different to allow for the air injection.
- J.
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