Hey man! Cars lookin good, just thought I’d mention.. I’ve built a few stock ecu builds, 8psi is fine but you’ll need a ” boost fuel reg” there really cheap, just a eBay one is ok! I’ve had them starve of fuel if you don’t touch the fuel at all! It’s dead simple to fit.. It just goes on your fuel return line, give a vacuum/boost source, set the base pressure to 50psi and that’s it!! Tuning is done 👍 As good as a dyno lol..

I run a gtx3071r .82Ar on my m54b25 with pump gas. 8PSI boost on this setup is perfect. Turbo spools hard and fast, almost feels like my old M62 V8. A 4th gear pull ill see full boost at nearly 3000RPM. Maybe 3250RPM. Just something to think about. I used to run and BW S257SX-E and that was great but it was a little laggy. Definitely coulda benefited from E85 on that setup. I saw full boost around 3500RPM or nearly 3850RPM depending on gear and load

leave the turbo mate! I was going to turbo my m54b25 with td05-20g - this turbo is already slightly larger then stock 1jz gte (ct15b). Your t06 is probably even bit larger. I would rather have less boost (if it will be needed) and ultrafast spool, then laggy big turbo setup. I have 3076 (ish - maxpeedingrods :D ) in B30 - and this still can be faster in throttle response. For sure would hate it in half liter less. Remember your purpose - probably more low then high speed drifting. Dyno pulls are loading the car A LOT more then drifting on second gear. You can tell on the dyno, that such turbo on 2,5l is kicking boost too fast, but on 4th gear loaded from 1,5k rpm :) This is not 2nd gear blipping. I would leave it :)

Small turbo will be high back pressure and lots of detonation. I wouldent run a turbine that small , it will really choke over 4500rpm ( Engine trying to breathe through a straw) your going to break a ringland in no time. ( I own multple s52/m52/m54 turbo cars) 3576 would be as small as i would go if you expect it to live. M50 motors breath. They are designed to be n.a. if it takes 8 or 10 pounds to make 400 crank, a jz needs a bar or more boost. Small turbos / high emap kill these engines over and over. The external w.g. dump may be your saving grace if you dont mind it loud ( lower emap )

what turbo manifold did you use ?

What manifold is that curious about doing mine as well thanks

What gearbox are you running? Zf or Getrag?

What headlight intake are you running?