I just purchased the PT-61 (not a typo, a GT)a few weeks ago.
According to PTE`s info, (if I recall correctly) the PT-61 is very close in performance to a TE-45a. I have used both now. The 61 spools so fast it`s silly. Mine has a .85 housing, and I am shocked at how fast it comes up on boost. It hits so hard on the bottom end I think need to go back to 28`s from the 26in tires I am using now. I believe Patrick told me it will support 690hp. But, with the cover up grade, it will flow about 10% more.
I highly recommend this turbo for a 90% street car like I have.
Thanks for listening...
Brian