My s475 was a bit slow spooling off the line, have never beaten a 1.9 60'
I did change to a 1.10 ar housing and still cut a 1.969 60' 😂 I'm guessing...
Most pribably don’t agree but I would get a t4 flange turbo. Something pretty big 76/80 but with a big exhaust side. Are you really going to race it...