I was wondering if anyone here is running a T-67 dbb or a T-71 dbb turbo on a 1jz with a ported head and cams. I'm mainly asking because I am coming up empty handed on compressor maps for either of these two turbos and I am very worried about surging with a T71. My aim is at least 600rwhp and i know a T67 dbb has done this on high boost. I was just curious if anyone has done a T71 dbb on a 1jz and if it surges. Thanks.