so iv got a ba xr6t 02 and iv just done a few things to it , new front mount and piping, bigger injectors, new air box with pod and had it tuned on the dyno but heres my problem now that it is running the higher boost "13" it seems to have trouble holding boost around 8/9 psi then will pick itself up again to the 13!

now can anyone help me out does this sound like i need a new waste gate actuator with a bigger spring? or could it be anything else?

any help would be much appreciated

so are you spooling up to 13psi then tapering off to 9psi at top end? if so, it will be the wastegate actuator...

nah as i hits about 9 it kinda holds that for a bit then will spike back up to 13

Might pay to take a look at your fuel regulator, I gather you are running an aftermarket fuel reg????

Cheers