HTA makes +8% TQ and +7% of power just after swap. It will for sure make more difference with tuning for HTA.
Also it makes 1 Bar of boost 200rpm sooner (4000rmp vs 4200rpm).
Also EGT drops from 850C to 810C.
Also HTA compressor is lighter and really have better throttle responce and faster goes back on boost after shifting.
And also it's sounds on boost just amazing
Actual photo of HTA and original 35R compressors, look at the center...and you will see why it moves more air with the same dimensions. It's not only 7 blades vs 6 blades difference.