Long story to be honest, but in short (yeah right) it would overboost under load each te. It kept going back but the tuner could not sort it out. Effectively it was doing
what it said, too much boost so went into limp mode. I replaced the turbo, all vacuum hoses, intercooler pipes and egr valve. Eventually enough was enough and the map was removed, set back to stock and a refund provided and no more limp mode. It definately put me off anything that doesn't have an awful lot or R&D behind it, and I would be requesting all values should I remap again. Although in fairness, the tuner was happy to keep trying to put
it right and was happy to offer the refund, which I'm not so sure would be as simple a process with companies that aren't site sponsors.