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turbine wheel contribute far less "work" to accelerating the rotating group's RPM - the primary component of the turbine wheel that produces the work to accelerate RPM of the rotating group are the blade tips - this is the area of the wheel that has the greatest diameter, but actually is the area of the wheel that produces the least backpressure. The exhaust gases are introduced into the turbine wheel in a radial fashion (perpendicular to the turbine shaft) and functions a lot like a paddlewheel on a boat (except the water would be making the wheel turn rather than the wheel making the water move). The largest component that generates backpressure is the trailing edges of the wheel, which is the part of the wheel you see in the first picture in my response. The stock turbos are small in relation to 400+ power levels and that turbine really starts to back things up. Clipping the turbine (in this application) would allow for improved gasflow on the top end with very little detriment to midrange torque (which is predicated mostly by the spoolup response). This is going to show comparatively small detriment to spoolup and midrange torque, but allow the turbine to flow exhaust gases easier where you really need it to - at high RPM. This, in turn, will improve top-end horsepower with very little impact on spoolup/midrange torque.
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