One of the lads coming to our club meet last night had a problem with his ERST...

Just accelerating normally and all of a sudden lost boost and pulled over.
It looked like the car had overboosted massively- It had blown the top boost hose off, blown the amal valve apart and distorted the pace alloy intercooler

What would cause this? Anyone?

The car is chipped with a -31 and should peak at about 17psi before dropping to 15...