Limp mode is around 0.6bar, so it isn't in limp. Clean out all the hoses to and from the boost control solenoid. Take special notice of the bottom hose as this has a brass restrictor in it. If this is partially blocked it will reduce boost. You can run with this hose removed to see if makes difference. But if everything is ok elsewhere it is likely to over boost with this hose off.
Some induction kits have poor filtration and cause the maf to get contaminated, so worth cleaning maf with carb cleaner and cotton.
Jgm will only be able to map the version 2 ESL board. These are normally £300 plus mapping fee.
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