Yep, you were right about that:
I found the white ball stone to be the most effective although the curve on the sides has been flattened out from use and it's started to take on more of a cylindrical shape now.
Anyways, managed to achieve what I needed with them. I had had the kit for years sitting in a drawer unused so it was just a bonus.
Previously the ID of the hole through the mounting flange was 3mm smaller than the pipe which meant there was a lip possibly disrupting/restricting airflow a bit. The inlet manifold opening hole was also bigger than 60mm, so no reason to be smaller. Now it's been opened up to match although from the photo looking into the inlet manifold it seems there's a lip on the left side of it's inlet (possibly the EGR replacement is not exactly built straight?), but I can live with that as it's better than it was.
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