Originally Posted by frechette821
hello, im just curious can u put STI heads on a ej25?
Yes. 2004+ Stis (USDM) have an ej257 engine. The EJ20X heads CAN go on an EJ25 but they bump compression. You should search for which one you want and what you are swaping them to (a n/a motor + low cc heads might make too high compression depending on what you are doing).