Looking at the graph he really wouldn't benefit much by revving any further unless he has really long gears and would lose a bunch of revs when shifting. That is a neat little turbo build. With a Disco Potato he would really have a nice quick spooling little street machine. That's interesting to see it overlayed with your NA build. That peak torque at 4200 is a bit surprising and quite impressive. Nice setup for sure, now put a bigger turbo on it!