lol... 8 turbos... someone is smoking some DAMN GOOD SHIT!!! but that's still no excuse for a lag machine...
anyhow, i can't beat that, but i can beat 5bar...
/me digs out old turbochargers book... i have here in front of me, a tractor... with 3 turbos... much the same config as you want... cept 2 blow into one, and that blows into the manifold... the result.... wait for it... 250PSI boost.. yeah... 250... two fifty... not twentyfive with an extra zero...