Its a little over 10. Which is fine because were using that higher figure to allow a quicker spool up. And it also means were getting more out off the charge mixture. So therefore you dont have to reduce CRs and you can still use appropriate boost. Also having checked, the cam is retarded by few degrees which reduces dynamic compression ratio.

The Mitsy/Scoobie turbo, also used on others, is a decent efficiency unit. It helps alot and is better suited than say a classic T3, T3/4 hybrid combo.

All that has been done is carefull select components that work together. Its nothing special, maybe a little out of the box for some.

If your unable to hold boost, or get yours to even play then i say at 6psi theres something wrong.