hehe....
37psi peaked on something larger

and not sooty.
think on that
2.2bar max on mine for more sensible level.... but lets not forget boost is only one factor, with actual airflow being the more significant.
How did Allards handle the expiration of the other units??
Allards were fantastic tbh when the second one snuffed it, as they were soo busy, they gave my instructions on
how to get the turbo off, although they were only joking when they suggested it, i gave it a go and managed to get it off. A carrier was sent on there behalf to collect it, they then collected the car 2 days later and fitted a brand new one on, turned the map down slightly, and then i collected the car. It was all done under warranty, and was all sorted, however, the first one i had no comeback on, as it was second hand, no warranty, so i lost £500 and had to pay another £800 to buy a new turbo, so was an exspensive learning curve to make and to realise not to buy second hand engine parts ever again.