Well as a general precaution I’ve stuck the inlet manifold in the parts washer for 24 hours then jet washed it this morning. The previous owner had taken off all the emissions junk but had clearly not bothered to take it off and clean it. It was still black inside after I’d had a go at it so it’s back in the washer soaking again. When taking it off I also discovered one of the 10mm bolts had been overtightened and stripped the threads. The muppet had stuck it in place with silicon?! So that has to be helicoiled. Turning into a bit of a pain in the arse this one...

How many miles are on your turbo out of curiosity?