Not sure why the "tooth" was chipped. The car lost power on the backstretch and threw a code. Oil was pouring out the bov and intercooler. If you see the turbine wheel in person, it's practily white from so much overheating (45k m). Just metal fatique, I guess. Thanks God it was not injested into the new shortblock. Oh, the car runs awesome by the way. Seigel nailed this tune. 18psi by 3300rpm, 20psi by 3500 in a 4th gear pull.