My MY05 STI is booked in for PPP next week and now that I have 1,400 miles on the car and taking it to 6000RPM in the first 3 gears at every opportunity it is starting to loosen up and show what it is made of. Still giving it a mix of engine speeds and after a few slip road dashes clipping 6000RPM I am letting it cool down for a few miles in 6th at 70MPH then exiting to re-join at the next slip road. It does seem to be be helping it loosen and even after 100 miles of the above continuous treatment it feels different.

Another 100 miles and I will lift the limiter to 6300RPM for 200 Miles and keep building it that way. This sytem has worked for all my previous cars from new and always given me a quick example each time. The first 1,000 miles was almost text book 4000RPM max, the last 100 miles before the oil change I had taken it to 4500 a few times. Then I spent 200 miles at 5000RPM, another 200 miles at 5500RPM and then as per above which is where I am upto now.

Roll on 10,000 miles and a fully loosened up engine !!