Yes basically this is correct!but there are many factors i.e how much air your engine can consume etc!but in general if you have a T3 on a stage 3 cossie running 23psi you would see around 300-310bhp but with a T34 maybe 330-340 due to the higher volume of air the T34 can move!so you could prob run the T34 at say 21 psi for 300 bhp!