i bought a t4 from one of my buddies he gave it to me pratically 20 bucks..its perfect with no shaft play...i was wondering it only has 2 middle passages is it just oil cooled? and would a built d seires push the exhaust a/r of 1.16

 

yes, just oil.
that turbine housing is too big. get a t3 and make your own t3/t4

 

a 3.0l supra engine wont spool a 1.16 ar t4 housing untill 4500rpm. It wouldnt see boost on a single cam untill a formula 1 like 20,000 rpm.