There is a few of us on here including James who used to work with Stu had over 400bhp from a T34.48. But remember it's flat out. My turbo is a bit of a hybrid unit as it originally was a grp A turbo with a 34 restrictor. Which I had rebuilt and fitted a std escos 34 front housing.

it peaks around 36psi at 5500rpm and then drops off.