This is the ffedback I got from my engine builder when I asked the same question
> Here is what I suggest for breakin, but of course always follow what
>your tuner says to do. THis is just what works best for me.
>
> First 300 miles, no boost no more than 4500rpms. Use non-synthetic oils
>of 10-30 weight. I use the cheapest oil I can find for the first round.
> Granny drive the car, and don't get on the highway and go for 300miles.
>That is not the right way to do it. The fueling needs to be pretty spot on,
>if not a little lean for this otherwise the rings will take forever to
>seat.
> AFter 300 miles, change oil/filter and put in non-synthetic again but
>use a decent brand. Now you don't want to run any more than 12-13psi boost
>and set your limiter to 6000rpms. Drive like this for 1200-1500miles.
>This is also where you will be working on your part throttle fueling. You
>should be able to get it dialed in within this mileage timeframe.
> If all is well after 1500 miles, change oil/filter again. Still no
>synthetics. Have the car dyno tuned and then immeadiately after, change
>the oil to full synthetic. Now your done. Every 5000 miles or so I usually
>do 3rd gear pulls from 1500rpms to redline and then leave it in gear and
>let the engine do the braking. I do this about 10-15 times. This just
>helps keep the rings fully seated and usually will also help keep the
>cylinders fairly clean of any buildup you might encounter