My rb20det s13 project is at about that point where I am looking into upgrading the turbo. I will be fabbing a top mount t3 mani myself and now I just need to narrow down the turbo selection. I have been looking at things such as the Garrett GT/GTX 3071 as the approximate size of the turbo I want to go with and stumbled upon the Bullseye Power s256 turbo. From the info that I have gathered it appears to be a Borg Warner/air werks s200 with some modification by bullseye. Here is the compressor map

looks pretty awesome to me. Anyways I just wanted to get honest feedback and opinions on this turbo set up for an rb20det. I dont really have any experience with borg warner so any comments would be appreciated. I would really like to get some insight on the reliability and and quality of these units. Seems almost impossible that I can pick one of these up for under $1k.