Sorry to throw a spanner in the works, but just wanted to check if you are pushing the engine hard or just want the engine for occasional use? I only ask this as the tsi is a waste of time for track work this is from my experience from going through 2 turbos as the engine just isn't cutout for it. It suffers from oil starvation to the turbo and oil surge etc... On hard track work. It will probably be fine on the road as isn't under anywhere near the stress of cornering on track. Just something to bear in mind, before chasing numbers just think about what the car is being used for track or road for long term reliability. Hope this is of help, you will see more info on my candy white rocco build thread.