I filled out an engineers report, that i got off quin direct's website (now liberty), got it stamped by a maim dealer garage and sent it in think my insurance went up by about €200. That was going from ek3 1.5 to a b16b with all running gear to match.
When I enquired I worded it in a way which made it seem like my engine needed to be replaced and this is the engine code of the new one im after buying I played dumb with the power upgrade dont know if that hepled with the price or not. I never changed the log book but was planning on doing that too but sold the car before I got around to it.