After my car was set up at stus in december its been holdin 24psi but over the past couple of days the cars not felt quite as strong top end, had nothin else 2 do 2night so i decided 2 do a boost test n realise my problem is its now only holdin 21.7,

Any ideas why this is? i was thinkin my actuator my b going slightly weak, i dont think i have any leaks as i havent touched any of the hoses since it was leak tested?

any help would b wicked cheers