Originally Posted by Kennyfvholla
ALL the timing components are swappable if you are using 25D heads.
And tytek.. I have a set of 96 2.5 HLA heads as well. I used to think that they'd be great for boost applications as well; but the more I learn, the more I think not. Especially since they apparently won't actually fit on a EJ22.
They need to be used with the EJ255 or 257 and applied to pre AVCS builds. Like an RSTI, for example. There are bunch of guys running those heads on the RS site.