So I'm starting my turbocharger project and I stumbled upon a brand new roto-masters turbo in my garage. I looked into the matter a little and found out rotomaster was purchased by garret a while back. So heres my question- how do I find out what the specs are for this turbo? the A/R is 60 if that help's, the compressor and the turbine seem to be about the same size. I don't really understand what seperates a t3 from a t4 other than that the t4 is bigger. BTW- does the t in t4 stand for turbonetics?