Ash - If you accept, i'll wager a slab of Carrona's that the GTRS is more reponsive/has more usable power than the hi-flow . Test to be done with both cars at the same dyno, on the same day. Once my car was finished i had intended to go for another Dyno run at Racingline, just to compare it to my previous tune, if Pete wants to meet up on the same day, that would also be great.
At the end of the day you can not compair a turbo that has been specifically researched, designed, engineered and tested for a particular engine to another turbo that has had a fraction of the $$$s in research, using ready-made turbines and housings, that had been designed for other purposes.
You are right about Pete's turbo, his adjustment/repair had slipped my mind. But only his response is "leagues above mine" (1000 rpm), my turbo easily made more power than his, peak power was self limited and with a shitty tune.