I remember back when they released the 'amazing' gt25r or whatever that supported 350bhp. now like ten years later its double?! I think that is a good benchmark for where we have gone from.
wow
https://www.turbobygarrett.com/turbo...?itok=lfA7K_bA
This one on a 2.0 looks pretty amazing.
07psi would take you to 300rwhp
15psi ""390rwhp
21psi ""430rwhp close to max output
A good street setup with a little N2O fogger and E85 or methanol would put that 2.0 over 500whp on most dyno