Well when the hx35 was still on, the probe was post turbo. Which from what I hear is 200* cooler. But still, I never pushed it to 1400*. With the hx40, it's laggy so it takes a little more pedal to get her goin, when she lights my egt's are sky high. Would the 18cm exhaust housing have anything to do with that. I know thats probably to big for my application but I really couldn't pass up the price. What do you mean had the cover and shaft pinned?