Just been out for a blip in my car after fitting apexi avcr,

just altered boost to 1 bar and impressed to say he least but at end of gears it feels like its hesitating a little and then i got to 138 in 6th and it started to slow down and wouldnt go any faster,

it got to 138mph so so easy just wouldnt go past that almost as if it ground to a halt,

any idea,

sounds like a pinking sort of sound(NOT SURE IF IT IS PINKING???) from engine bay after say 5000rpm but aint sure, neva did it before i turned the boost up it was peaking at 7 psi b4,

any help would be apreciated,

need it ready for sunday as i wanna go to santa pod and want it correct, please help me out guys