FP used to offer a billet compressor wheel for this turbo. It was called the hta88. The p-trim turbine wheel that your turbo has is a turd though. Best bet would be to cut your losses and sell your t4 based turbo for a more modern t3 turbo like any of Precision's offerings or FP's hta wheel 35r turbos.

 

The peakboost kit that I have is a t3 setup. I might just buy a 6262. Anyone know how much a 37r goes for?

 

The turbine housing is a t3, but the center section of your turbo is a t4.