Before my Te 63 gave up ( shaft play) I was running 10.51. I had no intentions of ever changing it. I think that there was a Te63 and a 63e which I believed had the actuator on it. I had the .85 housing and no actuator, no tap on the compressor housing and two delta gates. Everyone called it a big shaft turbo. You are moving pretty good with a turbo that has been out since the late 90's. ( Mine was from ESP in 1996) By the way you, mentioned "stock bottom end", no caps or girdle? Rolling the dice....(I hear ya). I was told that the turbo was good to about the 10.30 - 10.40 range.