I have the .70 housing. I wouldnt be suprised at all if clark just didnt like the turbo because its not a Garrett turbo but he said he can get at least 420ish on AZ 91pump out of this turbo. A conversation I had with him about a year ago just gave me the impession he thought the days of the journal bearing turbo where done. Any way the dude can tune. Ill give you guys my impressions when I get back.