The peak is just over 7 k rpm on the Race tune Si. ( stock Ed was 5850 )
The spike isn't really a power spike as such it's the way the dyno applies the brakes to keep a steady load, the more power the car has the more load it automatically applies, so the faster the power rises the harder the brakes are applied, as the dyno takes back control the brakes ease and you see a spike, the TAT software takes the spike into consideration before spitting a number out etc etc etc
( getting drowsy now ! )
We're testing more hardware soon, keep an eye on Facebook I'm sure you'll have seen something similar before
Jake I'll keep you posted you'll deffo be interested and want to try
Btw this run was under 27 pounds of boost,
Sure someone will jump in now with the nasties