The ash modified housings I would guess. It's a normal t25 housing that he punched out to fit a t3 3071 turbine wheel. Last year they had said that my turbos would be much better with the Atp t3 to t25 housings. I didn't want to spend the money on them until I had a running car. Unnessary expenses. The 3071s hit very hard right now at 5 grand. And it is very drivable above that mark. Shift at 67 and it stays in its power range, and doesn't loose it's spool. I actually like that it's like this. Very streetable and still able to be fast if you want to be. It's a lot like stock, just if you wanted to go just take it above 500.
