But the lad doesn't say it does 150mph, he said it does 140mph, which on an ERST you can get an indicated 140mph on the clock....

Anyway, if it has been chipped and runs 11psi, and has other stuff like exhaust, filter and the like - usual mods - it is entirely feasible that it DOES have 150bhp or over...

No whether you can run 19psi on a standard turbo and intercooler, thats a different story....