Varied load and not too many RPM is the key.
Backing off is useful too, the vacuum helps as much as positive pressure does.
So basically just drive it normally without racing the engine, but go a little steadier for the very first dozen or so miles as at that point the honing marks on the bores are particularly pronounced still. I normally do a few dozen miles and then pull the oil to remove any initial swarf, then replace with mineral again.
Ignore people on car forums quoting about "hard break ins" that are based on motorcycle engines built using totally different honing techniques that are just not at all relevent to a rebuild on an F4R engine.
If you have new cams, they are typically run in with 2000rpm for 20 mins, this can be done at rest though, the car doesnt need to be driven, so do this as you are warming up the engine to check there are no coolant leaks etc.
As mentioned by a couple of people already you want cheap mineral oil so it sees a bit of friction it wont run in properly with fully synth.
Was the car mapped for the same spec engine it has now?
If not then you could really end up damaging it as you run it in if the map is far out.