Broke in the sti motor today. It ran very well. Not excessive pinch, and idled very very well... After asking around, the common consensus on which turbo plug to use, I decided just to run the same hot P3 plug I've used in my O.S. motors. Used heat-cycle method by idling to temp then flushing with fuel by fattening up top while under half-full throttle. This worked very well with my O.S. Max XZ-28. Worked well again, and cycled much easier than expected. After about 5 tanks of this, I threw it down and put a few more through it, keeping it spitting. After that it just took a couple of hours on top to get it up to 200 and this thing sings! You can tell, its going to be a pleasure to work with. Has to be one of the easiest motors I've ever broken in, and idles without a hiccup. Also seems to have a super smooth powerband. Only time will tell.