Flatirons Tuning Tech Tips - Subaru turbo B25 Heads Vs D25 heads - What is the difference?

There are a lot of Subaru 2.5 liter, single AVCS turbo engines out there, and it turns out that there are 2 versions of that engine that are significantly different.

The simplest way to tell the difference comes down to the cylinder heads themselves, and those are either going to be B25 castings, or D25 castings.

So we put together this video on how to tell the difference, and exactly why it matters.

Hopefully this helps, and thanks for watching!