Thanks Hippo - wife came back last night and said noise is way worse and there's a power loss - thankfully brown trouser moment turned into red face moment - took it for a drive and it was a loud wooosh noise under acceleration with loss of power, yep you guessed it - split boost hose - the one just behind the power steering pump... lol - taped it up as a patch ( parcel tape is best for this i found out on a banger i used to drive) until i get one.
It was too late and i was too tired to test so hopefully today the reports will be all good. still going for a new header and fluid flush but.
so looks lie i had 2 issues first the tensioner then the boost hose split close behind, oh well learnt a bit more and didn't spend lots in fault finding..