I use to run 23 lbs of boost on the street with no problems.I tend to have my car tuned a little richer to be on the safe side.I might shoot for 780-800 volts and see how it runs then.I think the Garret hits a little to hard because when I hit full boost or get into 2nd it dangerously hooks to the left at 45 mph.Thats why I think the PTE .63 Housing is better for my application.When running that Housing before selling it(stupid me) I didn't go sideways but the car felt just as strong or even stronger with the PTE Housing.I thought the Garret would improve my first gear dramatically.It was noticeable but no where near worth it swapping out the PTE Housing in which my car ran better with.