Engine management light comes on, I get indicated full boost on both my displays but feels like half the power.

Switch off ignition and all good then a few minutes later engine management light on and same thing, feels like half power but indicating I'm getting the boost I've selected.

Car isles fine, no sudden stuttering or cutting out or similar.

Just engine management light comes on and put my foot down blitz dial solenoid boost controller and omori dash boost gauge indicate the boost I've set it to but feels like I'm back in a non turbo MR2.

Any ideas off the top of people's heads?