I've now put the unmodified vf36 core onto my P20 housing, so basically running a vf34p20, as expected I've got heaps more response down low compared to my modified back cut turbo.
I did some logging to check my AFR's, it ws running pretty rich at WOT, down into the low 10:1's, so I did some amateur DIY tuning to pull i bit of fuel out.

So it comes on nice and strong but as expected drops off at higher RPM's, where as my modified one pulls hard till redline.
So the plan is to go twin scroll on my modified turbo totry to pick up some response down low. (hopefully 500rpm earlier spool and i'll be happy)

I picked up some factory twin scroll headers for $200 and just rounding up a downpipe and bracket.

Anyway here's what my turbo looks like thats going back on. Its a VF36 with a back cut turbine and 18G compressor wheel, it also has a bronze bearing cage ported compressor cover. So its pretty much a PE1825 clone