That's what I installed, yes. I don't know how it got past me but when the stupid thing was carrying on like a two bob tart on the dyno I went and saw the bloke that put the engine together. That's what the seat pressures were. We ripped them out and put in a camtech single spring and Ti retainer package (which fit SO much better then the previous stuff), put it back on the dyno and issue was gone.
19 psi, 6500 rpm it would float at. Go half throttle it would go to 8000, give it more boost and it would fluff around at 5000 rpm.
Best bit was the camtech package was so much cheaper than the jap stuff, fit as it should and did the job.
Never tested what the seat pressures were as the swap was done in the car. But it went onto hold 30 psi no problems.