I've been told that this is what you should replace when the engine is out, since it is a nightmare to do it otherwise if they break:

- Knock sensor
- Ignition coils

I consider upgraded head gasket and head bolts (1,5 bar boost / 325 hp), but have no good motivation since I haven't had any problems with them. Pistons will be replaced, but what about connecting rods?

Anything else?