speaking as a member of 3si and as someone who has built a daily driving TT-SL with 10:1 compression, you can easily run 10psi on 91 and you can even run it to 16psi using meth injection of propane injection.

he just said its 10:1 compression ratio which is stock for the n/a cars. vr-4's are 8.0:1

how is it that you can TWIN turbo the 10:1 6g72 engine? i can see a single turbo at low boost like 7psi....but not twin...and if it is a twin turbo its at super low boost on both of them running extreemly high octane, not pump gas. I own a 1994 Mits 3kgt SL and i've been doing research on a Sin gle turbo project for awhile and talking with multiple turbo experts such as Turbonetics and speaking with multiple members of 3si.org they all say safely on the 10:1 6g72 put it at 7psi MAX....So i'm guessing that 3kgt in this video has alot of other work done to it. Maybe some dish pistons?