It went two thirds but been like that two years but power loss only past month, got box cleaned and boosting full of clock. Must of been blocked this long time but just got stuffed in the last month: look at side of engine and remove clamp and remove flexi and you will see massive see difference. Will be noisey but it’s a very quick and cheap test.
Get it sorted before your turbo goes as it’s under strain on pull or full boost. Post results after test